manipulating channel(s) Nuke

Shuffle node
- shuffle channels within one input.
ShuffleCopy node
- copy channels from input 1 and add them or replace channels of input 1＆2.
Copy node
- copy channel of input 1 to channel of input 2.
ChannelMerge node
- add, instersect, subtract channels from input 1&2.
Add node
- add non-existent channel of input 1 to input 2.
Remove node
- remove channel from input.