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Clever nodes I've observed:

• Having fun with RE - 0,1 Combinatorics
• Swapping adjacent elements in an array
• How to combine arrays with intersections
• Word list builder

Useful documents

• The strictures, according to Seuss
• I know what I mean. Why don't you?

To study

• Re: Regexp - match if not between [ ] - for (*SKIP) and (*FAIL)