When the expressions to be combined are small, write them all on one line.

F|G|H

When the combined expressions are large enough to take up a full line, write one expression
per line, with each subsequent expression aligned with the first and preceded by `|`

.
Indent the first expression to improve readability.

long expression|long expression|long expression

A sequence of parallel expressions often form the left hand side of a sequential combinator. Since the sequential combinator has higher precedence, use parentheses to group the combined parallel expressions together.

(expression|expression) >x>another expression