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suffix -ing
suffix -ed
suffix -er
suffix - est
100
spit ing
spitting
100
end ed
ended
100
spend er
spender
100
quick est
quickest
200
fit ing
fitting
200
zip ed
zipped
200
shift er
shifter
200
big est
biggest
300
swim ing
swimming
300
pet ed
petted
300
zip er
zipper
300
fast est
fastest
400
slip ing
slipping
400
spin ed
spinned
400
dim er
dimmer
400
black est
blackest
500
feed ing
feeding
500
fret ed
fretted
500
spin er
spinner
500
thin est
thinnest