this file format is :-
<no strings> <no frets>
o     3   5   7   9 ...............nth fret
n th string
%
6 23
0 1 1 1 1 1 0 0 2 2 2 0 3 3 3 3 3 3 3 3 3 3 3
1 1 1 1 1 1 0 2 2 2 2 0 3 3 3 3 3 0 0 0 0 0 0
1 1 1 0 0 0 0 2 2 2 0 3 3 3 3 3 0 0 0 0 0 0 0
1 1 1 0 0 2 2 2 2 2 0 0 3 3 3 0 0 0 0 0 0 0 0
1 1 1 0 0 2 2 2 0 0 3 3 3 3 3 0 0 0 0 0 0 0 0
1 1 1 1 0 2 2 2 0 0 3 3 3 0 0 0 0 0 0 0 0 0 0
