a purple purple purple
a purple purple purple .
a WORD_BOUNDARY p u r p l ə WORD_BOUNDARY p u r p l ə WORD_BOUNDARY p u r p l ə WORD_BOUNDARY
a WORD_BOUNDARY p u r p l e WORD_BOUNDARY p u r p l e WORD_BOUNDARY p u r p l e WORD_BOUNDARY . WORD_BOUNDARY