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R = {18,27,38,51}
domain = {4,5,6,7}
18 =x " +2 => 16 = x" => x=4
27 = x" +2 => 25 = x" => x=5
38 =x"+2 => 36 = x" => x=6
51 = x"+2=> 49=x" => x =7