text: You will view a stream of letters on the screen, one letter at a time.
  At the beginning of a block, you are told a number N.
  You have to remember the last N letters you saw since the beginning of the block.
  If the letter you see matches the letter N trials ago, press F, otherwise press Q.
  The case of the letter is irrelevant, so "t" matches "T" for example.
  If you make more than 5 mistakes in a block, N is decreased by 1.
  If you make fewer than 3 mistakes in a block, N is increased by 1.
  You will go through 20 blocks with 20+N trials each.
      
  Block 0, N = 2:
  You see the letter G.
  You see the letter G.
  You see the letter G and press <<F>>.
  You see the letter T.
  You see the letter g and press <<Q>>.
  You see the letter d.
  You see the letter t and press <<Q>>.
  You see the letter g and press <<Q>>.
  You see the letter t and press <<F>>.
  You see the letter V and press <<Q>>.
  You see the letter D and press <<Q>>.
  You see the letter g and press <<Q>>.
  You see the letter b and press <<Q>>.
  You see the letter t and press <<Q>>.
  You see the letter T and press <<F>>.
  You see the letter T and press <<F>>.
  You see the letter d and press <<Q>>.
  You see the letter t and press <<F>>.
  You see the letter D and press <<Q>>.
  You see the letter V and press <<Q>>.
  You see the letter t and press <<Q>>.
  You see the letter V and press <<F>>.
  
  Block 1, N = 2:
  You see the letter d.
  You see the letter t.
  You see the letter g and press <<Q>>.
  You see the letter b and press <<Q>>.
  You see the letter V and press <<Q>>.
  You see the letter b and press <<F>>.
  You see the letter B and press <<Q>>.
  You see the letter B and press <<Q>>.
  You see the letter G and press <<Q>>.
  You see the letter B and press <<F>>.
  You see the letter g and press <<F>>.
  You see the letter v and press <<Q>>.
  You see the letter V and press <<Q>>.
  You see the letter v and press <<F>>.
  You see the letter d and press <<Q>>.
  You see the letter B and press <<Q>>.
  You see the letter v and press <<Q>>.
  You see the letter b and press <<F>>.
  You see the letter D and press <<Q>>.
  You see the letter G and press <<Q>>.
  You see the letter b and press <<Q>>.
  You see the letter G and press <<F>>.
  
  Block 2, N = 3:
  You see the letter b.
  You see the letter V and press <<Q>>.
  You see the letter g and press <<Q>>.
  You see the letter B and press <<F>>.
  You see the letter g and press <<Q>>.
  You see the letter g and press <<F>>.
  You see the letter T and press <<Q>>.
  You see the letter v and press <<F>>.
  You see the letter t and press <<Q>>.
  You see the letter b and press <<Q>>.
  You see the letter b and press <<Q>>.
  You see the letter G and press <<Q>>.
  You see the letter t and press <<Q>>.
  You see the letter B and press <<F>>.
  You see the letter G and press <<Q>>.
  You see the letter D and press <<Q>>.
  You see the letter b and press <<F>>.
  You see the letter B and press <<Q>>.
  You see the letter T and press <<Q>>.
  You see the letter t and press <<F>>.
  You see the letter B and press <<Q>>.
  You see the letter b and press <<Q>>.
  You see the letter T and press <<F>>.
  
  Block 3, N = 3:
  You see the letter g.
  You see the letter d and press <<Q>>.
  You see the letter v and press <<Q>>.
  You see the letter B and press <<Q>>.
  You see the letter T and press <<Q>>.
  You see the letter v and press <<F>>.
  You see the letter B and press <<F>>.
  You see the letter d and press <<Q>>.
  You see the letter g and press <<Q>>.
  You see the letter B and press <<F>>.
  You see the letter B and press <<Q>>.
  You see the letter g and press <<F>>.
  You see the letter d and press <<F>>.
  You see the letter D and press <<Q>>.
  You see the letter d and press <<Q>>.
  You see the letter d and press <<F>>.
  You see the letter g and press <<Q>>.
  You see the letter G and press <<F>>.
  You see the letter v and press <<Q>>.
  You see the letter g and press <<Q>>.
  You see the letter B and press <<Q>>.
  You see the letter V and press <<F>>.
  You see the letter V and press <<Q>>.
  
  Block 4, N = 3:
  You see the letter G.
  You see the letter B and press <<Q>>.
  You see the letter T and press <<Q>>.
  You see the letter g and press <<F>>.
  You see the letter b and press <<F>>.
  You see the letter t and press <<F>>.
  You see the letter t and press <<Q>>.
  You see the letter g and press <<Q>>.
  You see the letter d and press <<Q>>.
  You see the letter t and press <<F>>.
  You see the letter T and press <<Q>>.
  You see the letter T and press <<Q>>.
  You see the letter g and press <<F>>.
  You see the letter b and press <<Q>>.
  You see the letter v and press <<Q>>.
  You see the letter d and press <<F>>.
  You see the letter v and press <<Q>>.
  You see the letter d and press <<Q>>.
  You see the letter d and press <<Q>>.
  You see the letter d and press <<Q>>.
  You see the letter D and press <<F>>.
  You see the letter b and press <<Q>>.
  You see the letter D and press <<Q>>.
  
  Block 5, N = 3:
  You see the letter d.
  You see the letter v and press <<Q>>.
  You see the letter g and press <<Q>>.
  You see the letter B and press <<Q>>.
  You see the letter V and press <<F>>.
  You see the letter B and press <<Q>>.
  You see the letter v and press <<Q>>.
  You see the letter t and press <<Q>>.
  You see the letter B and press <<F>>.
  You see the letter D and press <<Q>>.
  You see the letter t and press <<F>>.
  You see the letter b and press <<Q>>.
  You see the letter t and press <<Q>>.
  You see the letter B and press <<F>>.
  You see the letter B and press <<F>>.
  You see the letter G and press <<Q>>.
  You see the letter G and press <<Q>>.
  You see the letter G and press <<Q>>.
  You see the letter V and press <<Q>>.
  You see the letter v and press <<Q>>.
  You see the letter G and press <<F>>.
  You see the letter G and press <<F>>.
  You see the letter V and press <<F>>.
  
  Block 6, N = 3:
  You see the letter B.
  You see the letter D and press <<Q>>.
  You see the letter t and press <<Q>>.
  You see the letter d and press <<Q>>.
  You see the letter b and press <<Q>>.
  You see the letter t and press <<F>>.
  You see the letter g and press <<Q>>.
  You see the letter D and press <<F>>.
  You see the letter b and press <<Q>>.
  You see the letter T and press <<F>>.
  You see the letter b and press <<Q>>.
  You see the letter G and press <<F>>.
  You see the letter T and press <<Q>>.
  You see the letter b and press <<Q>>.
  You see the letter g and press <<F>>.
  You see the letter g and press <<Q>>.
  You see the letter B and press <<F>>.
  You see the letter g and press <<Q>>.
  You see the letter B and press <<F>>.
  You see the letter d and press <<Q>>.
  You see the letter g and press <<Q>>.
  You see the letter D and press <<Q>>.
  You see the letter G and press <<F>>.
  
  Block 7, N = 2:
  You see the letter G and press <<Q>>.
  You see the letter T and press <<Q>>.
  You see the letter D and press <<Q>>.
  You see the letter b and press <<Q>>.
  You see the letter g and press <<Q>>.
  You see the letter t and press <<Q>>.
  You see the letter t and press <<F>>.
  You see the letter t and press <<F>>.
  You see the letter B and press <<Q>>.
  You see the letter g and press <<Q>>.
  You see the letter B and press <<F>>.
  You see the letter G and press <<F>>.
  You see the letter T and press <<Q>>.
  You see the letter D and press <<Q>>.
  You see the letter b and press <<Q>>.
  You see the letter d and press <<F>>.
  You see the letter t and press <<Q>>.
  You see the letter D and press <<Q>>.
  You see the letter t and press <<F>>.
  You see the letter b and press <<Q>>.
  You see the letter g and press <<Q>>.
  You see the letter b and press <<F>>.
  
  Block 8, N = 3:
  You see the letter g and press <<Q>>.
  You see the letter d and press <<Q>>.
  You see the letter G and press <<Q>>.
  You see the letter G and press <<F>>.
  You see the letter v and press <<Q>>.
  You see the letter T and press <<Q>>.
  You see the letter D and press <<Q>>.
  You see the letter B and press <<Q>>.
  You see the letter B and press <<Q>>.
  You see the letter D and press <<Q>>.
  You see the letter B and press <<Q>>.
  You see the letter V and press <<Q>>.
  You see the letter t and press <<Q>>.
  You see the letter V and press <<F>>.
  You see the letter v and press <<Q>>.
  You see the letter B and press <<F>>.
  You see the letter D and press <<Q>>.
  You see the letter b and press <<F>>.
  You see the letter b and press <<Q>>.
  You see the letter d and press <<Q>>.
  You see the letter T and press <<F>>.
  You see the letter b and press <<Q>>.
  You see the letter T and press <<F>>.
  
  Block 9, N = 2:
  You see the letter g and press <<Q>>.
  You see the letter g and press <<Q>>.
  You see the letter b and press <<Q>>.
  You see the letter V and press <<Q>>.
  You see the letter b and press <<F>>.
  You see the letter D and press <<Q>>.
  You see the letter d and press <<Q>>.
  You see the letter d and press <<F>>.
  You see the letter d and press <<F>>.
  You see the letter B and press <<Q>>.
  You see the letter D and press <<Q>>.
  You see the letter v and press <<Q>>.
  You see the letter D and press <<F>>.
  You see the letter B and press <<Q>>.
  You see the letter t and press <<Q>>.
  You see the letter V and press <<Q>>.
  You see the letter T and press <<F>>.
  You see the letter G and press <<Q>>.
  You see the letter g and press <<Q>>.
  You see the letter t and press <<Q>>.
  You see the letter G and press <<F>>.
  You see the letter D and press <<Q>>.
  
  Block 10, N = 3:
  You see the letter g and press <<Q>>.
  You see the letter g and press <<Q>>.
  You see the letter G and press <<Q>>.
  You see the letter G and press <<F>>.
  You see the letter v and press <<Q>>.
  You see the letter g and press <<F>>.
  You see the letter G and press <<F>>.
  You see the letter D and press <<Q>>.
  You see the letter T and press <<Q>>.
  You see the letter t and press <<Q>>.
  You see the letter D and press <<F>>.
  You see the letter b and press <<Q>>.
  You see the letter t and press <<F>>.
  You see the letter t and press <<Q>>.
  You see the letter g and press <<Q>>.
  You see the letter g and press <<Q>>.
  You see the letter T and press <<F>>.
  You see the letter g and press <<F>>.
  You see the letter D and press <<Q>>.
  You see the letter d and press <<Q>>.
  You see the letter T and press <<Q>>.
  You see the letter v and press <<F>>.
  You see the letter g and press <<F>>.
  
  Block 11, N = 4:
  You see the letter G and press <<Q>>.
  You see the letter T and press <<Q>>.
  You see the letter g and press <<Q>>.
  You see the letter G and press <<Q>>.
  You see the letter t and press <<Q>>.
  You see the letter v and press <<Q>>.
  You see the letter G and press <<Q>>.
  You see the letter g and press <<F>>.
  You see the letter V and press <<Q>>.
  You see the letter G and press <<Q>>.
  You see the letter B and press <<Q>>.
  You see the letter v and press <<Q>>.
  You see the letter B.
  You see the letter g and press <<F>>.
  You see the letter T and press <<Q>>.
  You see the letter t and press <<Q>>.
  You see the letter B and press <<Q>>.
  You see the letter G and press <<F>>.
  You see the letter T and press <<Q>>.
  You see the letter G and press <<Q>>.
  You see the letter D and press <<Q>>.
  You see the letter g and press <<F>>.
  You see the letter V and press <<F>>.
  You see the letter V and press <<Q>>.
  
  Block 12, N = 4:
  You see the letter V and press <<Q>>.
  You see the letter b and press <<Q>>.
  You see the letter G and press <<Q>>.
  You see the letter d and press <<Q>>.
  You see the letter G and press <<Q>>.
  You see the letter b and press <<F>>.
  You see the letter d and press <<Q>>.
  You see the letter G and press <<F>>.
  You see the letter g and press <<F>>.
  You see the letter D and press <<F>>.
  You see the letter G and press <<Q>>.
  You see the letter B and press <<Q>>.
  You see the letter b and press <<Q>>.
  You see the letter D and press <<F>>.
  You see the letter d and press <<Q>>.
  You see the letter B and press <<F>>.
  You see the letter D and press <<Q>>.
  You see the letter D and press <<F>>.
  You see the letter B and press <<F>>.
  You see the letter D and press <<Q>>.
  You see the letter b and press <<F>>.
  You see the letter d and press <<Q>>.
  You see the letter G and press <<F>>.
  You see the letter d and press <<F>>.
  
  Block 13, N = 3:
  You see the letter V and press <<Q>>.
  You see the letter T and press <<Q>>.
  You see the letter V and press <<Q>>.
  You see the letter t and press <<Q>>.
  You see the letter t and press <<F>>.
  You see the letter T and press <<Q>>.
  You see the letter B and press <<Q>>.
  You see the letter v and press <<F>>.
  You see the letter V and press <<Q>>.
  You see the letter T and press <<F>>.
  You see the letter d and press <<Q>>.
  You see the letter V and press <<Q>>.
  You see the letter T and press <<F>>.
  You see the letter g and press <<Q>>.
  You see the letter g and press <<Q>>.
  You see the letter b and press <<Q>>.
  You see the letter G and press <<F>>.
  You see the letter g and press <<F>>.
  You see the letter t and press <<Q>>.
  You see the letter g and press <<Q>>.
  You see the letter g and press <<Q>>.
  You see the letter v and press <<Q>>.
  You see the letter B and press <<F>>.
  
  Block 14, N = 2:
  You see the letter D and press <<Q>>.
  You see the letter g and press <<Q>>.
  You see the letter t and press <<Q>>.
  You see the letter B and press <<Q>>.
  You see the letter b and press <<Q>>.
  You see the letter v and press <<Q>>.
  You see the letter v and press <<Q>>.
  You see the letter d and press <<Q>>.
  You see the letter V and press <<F>>.
  You see the letter d and press <<Q>>.
  You see the letter v and press <<F>>.
  You see the letter d and press <<F>>.
  You see the letter v and press <<Q>>.
  You see the letter D and press <<F>>.
  You see the letter B and press <<Q>>.
  You see the letter T and press <<Q>>.
  You see the letter b and press <<F>>.
  You see the letter g and press <<Q>>.
  You see the letter G and press <<Q>>.
  You see the letter t and press <<Q>>.
  You see the letter b and press <<Q>>.
  You see the letter v and press <<Q>>.
  
  Block 15, N = 3:
  You see the letter t and press <<Q>>.
  You see the letter T and press <<Q>>.
  You see the letter G and press <<Q>>.
  You see the letter G and press <<Q>>.
  You see the letter g and press <<Q>>.
  You see the letter G and press <<F>>.
  You see the letter B and press <<Q>>.
  You see the letter V and press <<Q>>.
  You see the letter D and press <<Q>>.
  You see the letter V and press <<F>>.
  You see the letter T and press <<F>>.
  You see the letter d and press <<F>>.
  You see the letter B and press <<Q>>.
  You see the letter t and press <<Q>>.
  You see the letter d and press <<F>>.
  You see the letter d and press <<Q>>.
  You see the letter d and press <<Q>>.
  You see the letter d and press <<Q>>.
  You see the letter D and press <<F>>.
  You see the letter d and press <<F>>.
  You see the letter B and press <<Q>>.
  You see the letter G and press <<Q>>.
  You see the letter T and press <<Q>>.
  
  Block 16, N = 3:
  You see the letter t and press <<Q>>.
  You see the letter B and press <<Q>>.
  You see the letter t and press <<Q>>.
  You see the letter B and press <<Q>>.
  You see the letter d and press <<Q>>.
  You see the letter t and press <<F>>.
  You see the letter B and press <<F>>.
  You see the letter d and press <<F>>.
  You see the letter v and press <<Q>>.
  You see the letter v and press <<Q>>.
  You see the letter g and press <<Q>>.
  You see the letter b and press <<Q>>.
  You see the letter D and press <<Q>>.
  You see the letter G and press <<F>>.
  You see the letter D and press <<F>>.
  You see the letter t and press <<F>>.
  You see the letter g and press <<F>>.
  You see the letter v and press <<Q>>.
  You see the letter D and press <<Q>>.
  You see the letter G and press <<Q>>.
  You see the letter V and press <<F>>.
  You see the letter B and press <<Q>>.
  You see the letter t and press <<F>>.
  
  Block 17, N = 3:
  You see the letter V and press <<Q>>.
  You see the letter g and press <<Q>>.
  You see the letter b and press <<Q>>.
  You see the letter V and press <<F>>.
  You see the letter B and press <<Q>>.
  You see the letter B and press <<F>>.
  You see the letter v and press <<Q>>.
  You see the letter v and press <<F>>.
  You see the letter g and press <<F>>.
  You see the letter v and press <<F>>.
  You see the letter G and press <<Q>>.
  You see the letter B and press <<F>>.
  You see the letter v and press <<Q>>.
  You see the letter T and press <<Q>>.
  You see the letter V and press <<F>>.
  You see the letter t and press <<F>>.
  You see the letter d and press <<Q>>.
  You see the letter t and press <<F>>.
  You see the letter G and press <<Q>>.
  You see the letter b and press <<Q>>.
  You see the letter t and press <<F>>.
  You see the letter G and press <<F>>.
  You see the letter g and press <<Q>>.
  
  Block 18, N = 2:
  You see the letter d and press <<Q>>.
  You see the letter b and press <<Q>>.
  You see the letter d and press <<F>>.
  You see the letter b and press <<F>>.
  You see the letter g and press <<Q>>.
  You see the letter B and press <<Q>>.
  You see the letter b and press <<Q>>.
  You see the letter T and press <<Q>>.
  You see the letter d and press <<Q>>.
  You see the letter t and press <<F>>.
  You see the letter B and press <<Q>>.
  You see the letter g and press <<Q>>.
  You see the letter D and press <<Q>>.
  You see the letter d and press <<F>>.
  You see the letter v and press <<Q>>.
  You see the letter G and press <<Q>>.
  You see the letter v and press <<F>>.
  You see the letter g and press <<F>>.
  You see the letter v and press <<Q>>.
  You see the letter T and press <<Q>>.
  You see the letter b and press <<Q>>.
  You see the letter D and press <<Q>>.
  
  Block 19, N = 2:
  You see the letter d and press <<Q>>.
  You see the letter d and press <<Q>>.
  You see the letter g and press <<Q>>.
  You see the letter G and press <<Q>>.
  You see the letter g and press <<F>>.
  You see the letter G and press <<F>>.
  You see the letter D and press <<F>>.
  You see the letter b and press <<Q>>.
  You see the letter G and press <<Q>>.
  You see the letter T and press <<Q>>.
  You see the letter G and press <<F>>.
  You see the letter T and press <<F>>.
  You see the letter d and press <<Q>>.
  You see the letter T and press <<F>>.
  You see the letter V and press <<Q>>.
  You see the letter B and press <<Q>>.
  You see the letter d and press <<Q>>.
  You see the letter T and press <<Q>>.
  You see the letter T and press <<F>>.
  You see the letter T and press <<Q>>.
  You see the letter G and press <<Q>>.
  You see the letter T and press <<F>>.
  