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Tanveer constructs a wall working in a special way and takes 12 days to complete it. If Sn is the length of the wall (in m) that he constructs on the nth day, then
Sn = 2n, 0 < n < 4
Sn = 8, for n = 5
Sn = 3n − 7, 6 < n < 12
Find the total length of the wall he constructs in the first 10 days.