Solved
find letter series {a , bc, def, ghij, klmno __________________________ a-z}
A, 1
BC, 2
DEF, 3
GHIJ, 4
KLMNO 5
--------- --
A to Z 26
A, 1
BC, 2
DEF, 3
GHIJ, 4
KLMNO 5
--------- --
A to Z 26
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