1. 1.
    +3 -1
    1_ 15+16=31

    2_ 42-23=19

    4+8=12

    19+12=31

    3_ 4+8= 12

    42-12=30

    '23' 3-2=1

    30+1=31

    4_ '15'= 1+5=6

    '16'=1+6=7

    '42'= 4+2=6

    4+8+6+7+6=31
    ···
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