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t/2-t/3+t/6 <= 4
3t/6 - 2t/6 +t/6 <= 4
2t/6 <= 4
2t <= 4 x 6
2t <= 24
t <= 24 : 2
t <= 12
3t - 2t ≤ 24 - t
t ≤ 24 - t
2t ≤ 24
t ≤ 12