br/r – brush/rush, brain/rain
br/b – broom/boom, break/rake
cr/r – crash/rash, crane/rain
cr/c – crash/cash, crane/cane
dr/r – draw/roar, drip/rip
dr/d – draw/door, drip/dip
fr/r – fright/right, fried/ride
fr/f – fright/fight, frog/fog
gr/r – grip/rip, ground/round
gr/g – grill/gill, grate/gate
pr/r – price/rice, pram/ram
pr/p – prick/pick, pray/ray
tr/r – tray/ray, train/rain
tr/t – trick/tick, trip/tip
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