53 - add 10, 69 - subtract 1, 54 - take away 10, 16 - add 1, 25 - add 10, 63 - take away 10, 46 - add 1, 73 - add 1, 34 - subtract 10, 44 - subtract 1, 11 - add 20, 44 - take away 30, 21 - take away 20,

Add. subtract 1 or 10

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