function n = colonne_utilise(L,k)
    c = L(k,43);
    if c == '1'
        n = 1;
    end
    if c == '2'
        n = 2;
    end
    if c == '3'
        n = 3;
    end
    if c == '4'
        n = 4;
    end
    if c == '5'
        n = 5;
    end
    if c == '6'
        n = 6;
    end
    if c == '7'
        n = 7;
    end
end