         Sentence 1: They also raise grave concerns,  about _ the Tecent. proliferation 0  expensive commercial’ early _learnin  centers, in which infants are barrage  with letter and number fiashcards and  slightly older toddlers, are drenched in a  full curriculum of reading, math, science,  art, music, gym, and more.    Sentence 2: There has been a dramatic  decrease ‘in expensive early learning  centers.