Double: 1+1=2, 2+2=4, 3+3+6, 4+4=8, 5+5=10, 6+6=12, 7+7=14, 9+9=18, 8+8=16, 10+10=20, Not doubles: 1+2=3, 2+3=5, 3+4=7, 4+5=9, 5+6=10, 6+7=13, 7+8=15, 8+9=17, 9+10=19,

sorting doubles and not doubles

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