What do the codes mean in Box 11 of the estate K-1?

Final Year Deductions
A: Excess deductions on termination - Section 67(e) expenses
B: Excess deductions on termination - Non-Miscellaneous itemized deductions
C: Short-term unused capital loss carryover
D: Long-term unused capital loss carryover
E: Net operating loss carryover - regular tax
F: Net operating loss carryover - minimum tax

See the Schedule K-1 (Form 1041) instructions  for more info about these codes.