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Several steps can be directly linked to a immediate succeeding transition through:

Grafcet evolution rule number 5 states that, when a step is simultaneously activated and deactivated it remains active!

The OR divergence is represented by an horizontal line with one immediate preceding connection and

A transition-condition is

A transition-condition…

A source transition does not have any immediate preceding step.

A transition to be enabled has to have all the immediate preceding steps active

A pit step has only a transition immediate preceding.

By Grafcet evolution rule number 4 several transitions which can be simultaneously cleared…

The steps skip is a particular case of …