Completion requirements

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This shows a figure containing a doing and undoing diagram. The doing diagram has two rectangular boxes in the middle, the 1^{st} containing ‘add 4’ linked to the 2^{nd} box on the right containing ‘multiply by 2’. To the left of the 1^{st} box is the word number, linked by an arrow pointing right. On the right of the 2^{nd} rectangular box is an arrow pointing right to the number 14.

The undoing diagram has two rectangular boxes in the middle, the 1^{st} containing ‘divide by 2’ linked to the 2^{nd} box on the right containing ‘subtract 4’. The arrow linking the two boxes has the number 7 above it. To the left of the 1^{st} box is the number 14, linked by an arrow pointing right. On the right of the 2^{nd} rectangular box is an arrow pointing right to the number 3.