What does IP mean?

DBA

DEG

ADI

FFD

1ST LETTER SUM: 4+4+1+6 = 15

2ND LETTER SUM: 2+5+4+6 = 17

does not met constraint that sum is at least as large

--------------------------------------------------

DEG

ADI

FFD

FDF

1ST LETTER SUM: 4+1+6+6 = 17

2ND LETTER SUM: 5+4+6+4 = 19

does not met constraint that sum is at least as large

---------------------------------------------------

DBA

FFD

FDF

BAI

1ST LETTER SUM: 4+6+6+2 = 18

2ND LETTER SUM: 2+6+6+1 = 15

This combination is acceptable.

---------------------------------------------------

Do not know what IP means or how implemented.

However, a way to solve:

Get ALL combinations of the 8 words taken 4 at a time

& calculate the sum of the 1st letters & 2nd letters:

if the constraint is not met, discard that set.

Of the sets remaining

determine the sum of the 3rd letter and choose the maximum

value.