Performs a logical NAND (NOT AND) operation.
Returns `1` if at least one of the values is zero, otherwise returns `0`.
lnand(value1, value2)
lnand(1, 1); // returns 0
lnand(1, 0); // returns 1
lnand(0, 5); // returns 1
lnand(0, 0); // returns 1
lnot land lor lxor lnand lnor lxnor