% |       exa1            F
% 5                       +
% |       B   C           |\      H   I
% 4       +---+           | \ G   +---+
% |   A   |   \           |  \    |   |   J
% 3   +---+    \          |   +---+   +---+
% |             \ D   E   |
% 2              \+   +---+
% |               |   |
% 1               +---+
% |
% 0__________________________________________
%     1   2   3   4   5   6   7   8   9   10


% |       exa2             E
% 5                        +
% |       B   C          /  \          G   H
% 4       +---+         /    \ F    ___+---+
% |   A   |   |        /      \ ___/
% 3   +---+   |       /        +
% |           |   D  /
% 2           +---+/
% |
% 1
% |
% 0__________________________________________
%     1   2   3   4   5   6   7   8   9   10

exa1() :& 
        [rng[1,3,3],                   % A
         rng[2,3,4],                   % B
         rng[3,4,4],                   % C
         rng[4,2,1],                   % D
         rng[5,1,2],                   % E
         rng[6,2,5],                   % F
         rng[7,3,3],                   % G
         rng[8,3,4],                   % H
         rng[9,4,3],                   % I
         rng[10,3,3]].                 % J


exa2() :& 
        [rng[1,3,3],                   % A
         rng[2,3,4],                   % B
         rng[3,4,2],                   % C
         rng[4,2,2],                   % D
         rng[6,5,5],                   % E
         rng[7,3,3],                   % F
         rng[9,4,4],                   % G
         rng[10,4,4]].                 % H