B:	To try to make them more effective and useful.
b iː WORD_BOUNDARY t ə WORD_BOUNDARY t ɹ aɪ WORD_BOUNDARY t ə WORD_BOUNDARY m eɪ k WORD_BOUNDARY ð ɛ m WORD_BOUNDARY m ɔ ɹ WORD_BOUNDARY ɪ f ɛ k t ɪ v WORD_BOUNDARY æ n d WORD_BOUNDARY j uː s f ə l WORD_BOUNDARY