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1 solution
1 2 + 1 × 2 = 1 4
1 4 + 1 × 4 = 1 8
1 8 + 1 × 8 = 2 6
2 6 + 2 × 6 = 3 8
3 8 + 3 × 8 = 6 2
6 2 + 6 × 2 = 7 4