Keys -> row
Keys -> col

PasTri row col -> Prt

Halt

Def PasTri row col .

Eq col 0 -> temp1
Eq row col -> temp2
Or temp1 temp2 -> easy
easy -> Jmp easy:

Sub col 1 -> upLeft
Sub row 1 -> rowAbove
PasTri rowAbove upLeft -> res1
PasTri rowAbove col -> res2
Add res1 res2 -> Ret

easy:
  1 -> Ret