Tuples are tied using parentheses:

(a, b, c)

For a:A, b:B, and c:C, the type of such a tuple is (A, B, C).

It is possible to declare a variable of the tuple type:

d:(A, B, C);

and to assign values to it:

d <- (a, b, c);

To untie a tuple, use parentheses on the left:

(a, b, c) <- d;