4 + □ = 9 , □ = 0, □ = 5, 3 + □ = 10 , □ = 7, □ = 2, 7 + □ = 9 , □ = 0, □ = 2, 5 + □ = 8, □ = 0, □ = 3, 2 + □ = 6 , □ = 0, □ = 4, 6 + □ = 10 , □ = 0, □ = 4, 8 + □ = 10 , □ = 0, □ = 2, 1 + □ = 7 , □ = 0, □ = 6, 9 + □ = 10 , □ = 0, □ = 1, 3 + □ = 8 , □ = 0, □ = 5, □ + 3 = 9 , □ = 6, 9.

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