将单词加或减字母成为新词
rain-_rain-_rain_ _ _
call-_all-_all-_all-_all-_ _all
sea-_ea-_ea_-_ _ea_-ea_ _
cow-_ow-_ow-_ow_ _
sweep-s_eep-s_eep-_eep
ill-_ill-_ill-_ill-_ _ill
it-_it-_it-_it-_it-_it_ _ _
cat-_at-_at-_at-_at-__at
ate-_ate-_ate-_ate-_ate-__ate
noon-_oon-_oon-_ _oon
an-_an-_an-an_-an_-_an_
yet-_et-_et-_et-_et-_et
lay-_ay-_ay-_ay-_ay-_ _ay
yard-_ard-_ard-ar_-_ _ar_
dish-_ish-_ish-_ _ _ish
top-_top-_ _op-_op