The number of letters between successive letters is increasing by 1 on each occasion.
E (F,G)
H (I,J,K)
L (M,N,O,P)
Q (R,S,T,U,V)
W.....is the next letter
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T (letters without curves)
E F H L and T
Hey, no cheating!
H-E-L-L!
Only 'pooh' seems to fit.