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Small friends

Complements to 5 for using the upper bead.

Addition
OperationFormula
+1+5 -4
+2+5 -3
+3+5 -2
+4+5 -1
Subtraction
OperationFormula
-1-5 +4
-2-5 +3
-3-5 +2
-4-5 +1