Group the elements into sets of two.
a, b, c, d, e, f
[ (a, b), (c, d), (e, f) ]
Complete the following task based on the instruction and optional input provided.### Instruction:
Group the elements into sets of two.

### Input:
a, b, c, d, e, f

### Output:
[ (a, b), (c, d), (e, f) ]