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.