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- function krest(r)
- for s = 'owns'
- marking(r, s);
- endfor
- r.mark();
- endfunction
- function marking(r, s)
- l = 0;
- while !r.is_bord(s)
- l += 1;
- r.step(s);
- r.mark();
- endwhile
- for k = 1:l
- r.step(reverse(s));
- endfor
- endfunction
- function s = reverse(s)
- if s == 'o'
- s = 'w';
- elseif s == 'w'
- s = 'o';
- elseif s == 'n'
- s = 's';
- elseif s == 's'
- s = 'n';
- endif
- endfunction
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