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Answers and rating deltas for

What does 'null?', 'procedure?' and 'symbol?' mean in the following code?

Author Votes Δ
sepp2k 6 +0.77
Basile Starynkevitch 1 -0.61
antispinwards 1 -1.26
Last visited: Mar 26, 2019, 2:14:31 PM