The a true parallel derivation mode. All rules are applied via every possible match parallel. A single node may be deleted/replaced by several rule applications.

This works similar to the interpretation of a D0L-System but in GroIMP it can be actually applied thanks to the graph representation. Assuming to apply a rule set:

 A ==> B
 A ==> C
 A ==> A

on an axiom `A D` the following changes can be examine, because all three rules replace the A at the same time.