I need to combine a formula

=IF(AND(B11=10,B12=13),"NO","YES") FOMULA WORKS UNTIL I ADD THE FOLLOWING
AND THE FORMULA LOOKS LIKE THIS

=IF(AND(B11=10,B12=13),"NO","YES",IF(AND(B11=14,B1 2=15),"MEET","SEAT"))

How would I combine the two with out errors, I seem to missing something? If
I use the same formula not using the (and) it works fine. I'm stump.

many thanks for any help I could get!

Larry