%
% Simple variant:
% from http://twan.home.fmf.nl/blog/haskell/Nonograms.details
% (2 solutions)
rows = 4;
row_rule_len = 2;
row_rules = array2d(1..rows, 1..row_rule_len, 
    [
      1,1,
      1,1,
      1,1,
      1,1
    ]);

cols = 4;
col_rule_len = 2;
col_rules = array2d(1..cols, 1..col_rule_len,
    [
      1,1,
      1,1,
      1,1,
      1,1,
    ]);