Returns true if the first expression is equal to one or more of the specified discrete values, otherwise false.
x ← in(expression, value1, value2, ..., valueN)
in(q1,8,9,10)
The above is equilavent to writing:
(q1==8 or q1==9 or q1==10)
Note: It's okay to provide just one value:
in(q1,5)
which is the same as writing:
(q1==5)