use '?' for JOKER (blank)

From letters I, S, S, E, I, S  I made following words

6 letter words

isseis[6]

5 letter words

issei[5], sises[5]

4 letter words

seis[4]

3 letter words

sei[3], ess[3], sis[3]

2 letter words

es[2], is[2], si[2]