Degrees of comparison. Choose the correct spelling.

pretty
prettier, prettiest
prettyer, prettyest
prettier, prettiest
pretter, prettest

cold
colder, coldest
coldier, coldiest
coldder, colddest
colderer, colderest

young
youngier, youngiest
younger, youngerest
younger, youngest
youngerer, youngerest

rude
ruderer, ruderest
ruderer, rudest
ruder, ruderest
ruder, rudest

hot
hoter, hotest
hotterer, hottest
hoter, hoterest
hotter, hottest

thin
thiner, thinest
thiner, thinerest
thinner, thinnerest
thinner, thinnest

red
redder, reddest
reder, redest
redier, rediest
reddier, reddiest

easy
easyer, easyest
easier, easiest
easer, easerest
easerer, easerest

late
later, latest
latter, latterest
latier, latiest
laterer, laterest

good
gooder, best
gooder, goodest
better, best
goodier, goodiest

bad
worse, worst
worser, worsest
badder, baddest
bader, badest

far
farer, farest
farther, farthest
farier, fariest
fartherer, fartherest