"Hello, World!" 1 2 3 + 80 ÷ 20 × [11 22 33] [39 33 44] + [...] 3 [...[1 2 3]] [1_3_6 6_3_1] [[[1_3_6 6_3_1]] [[1_3_6 6_3_1]]] . [1 2 3 4 5 6 7 8 9] ↘ 5 ⇡ 100 ↘ 82 ⇡ 2_5