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5 letter words:

aback13,

4 letter words:

back12, pack12, kapa10, abac8, caba8, capa8, paca8,

3 letter words:

kab9, aka7, bac7, bap7, cab7, cap7, pac7, aba5, baa5, caa5,

2 letter words:

ka6, ab4, ba4, pa4, aa2,