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data Mode = Start | Read | Skip | End
data State = State Mode String String [String]
space c = elem c [' ', '\n', '\r', '\f', '\t', '\v', '\160']
end r = State End "" "" r
skip t r = State Skip t "" r
get t w r = State Read t w r
start t = State Start t "" []
step (State Start at@(t:ts) w r)
| space t = step $ skip at r
| otherwise = step $ get at w r
step (State Read at@(t:ts) w r)
| space t = step $ skip at $ r ++ [w]
| otherwise = step $ get ts (w ++ [t]) r
step (State Skip at@(t:ts) _ r)
| space t = step $ skip ts r
| otherwise = step $ get at "" r
step (State Start "" _ r) = step $ end r
step (State Read "" w r) = step $ end $ r ++ [w]
step (State Skip "" _ r) = step $ end r
step (State End _ _ r) = r
words' text = step $ start text