str
striking, stronger, strengthen
fl
flower, flying, flip-flop
dr
dreaming, drowning, drinking
cl
classroom, closet, closer
gr
greenwood, greatness, grateful
sw
swallow, sweetheart, sweater
tr
treatment, transport, traffic
gl
glory, global, glitter
sk
skimming, skinny, skateboard
pr
practice, problem, premium
cr
cricket, cracker, crazy
fr
friendship, frozen, Friday
scr
scrambled, scrapbook, scraper
bl
blanket, blinder, bleeding
sn
snowy, snorkle, sneaker