Pickit 3 F8F7;
100ct nodes
Backward no nulls 1 group check.
Backward no nulls, 10 group, check.
Backward no nulls, 50 group, check.
Backward 10 nulls, 1 group, check.
Backward 10 nulls, 10 group, check.
Backward 10 nulls, 45 group, nulls at correct channels near ssc, check.
Backward 5 nulls, 5 group, nulls correct, check.
NOTE: With groups you need to remember actual node count must be at least the group totals and/or nulls plus group totals, or you lose last group. This could be "fun" in the event you miscount nodes and are a node short...