I4D : G9F → I – 2 = G; 2² = 4; (2 + 1)² = 3² = 9; D + 2 = F L16S : J25U → L – 2 = J; 4² = 16; (4 + 1)² = 5² = 25; S + 2 = U W64R → W – 2 = U; 8² = 64; (8 + 1)² = 9² = 81; R + 2 = T
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