L: [1, 2, 3, 4, 5];
M: [[1, 2, 3], [4, 5, 6], [7, 8, 9]];

write_data(L, "daneL.txt");

write_data(M, "daneM.txt");

read_list("daneL.txt");

read_list("daneM.txt");

read_list("daneM.txt");

read_list("daneZ.txt");