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S2 = 2^2+1 - 4
S2 = 2^3 - 4
S2 = 8-4
S2 = 4
S3 = 2^3+1 - 4
S3 = 2^4 - 4
S3 = 16 - 4
S3 = 12
rasio = S3/S2 = 12/4 = 3