MATHEMATICAL TERM: KNOCK KNOCK #3

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Knock Knock
Who's there?
"1,2,3,4,5,6,7"
1,2,3,4,5,6,7 who?
Got to believe in magic. Tell me 1, 2, 3, 4, 5, 6, 7 oh oh~!
MATHEMATICAL TERM: KNOCK KNOCK #3 | EcencyMATHEMATICAL TERM: KNOCK KNOCK #2thisisruby ·