function [ret] = find_priority(M)
    [m_rows, m_cols] = size(M);
    ret = [];
    for col = 1:m_cols
        M(:, col) = M(:, col)./sum(M(:, col));
    end
    for row = 1:m_rows
        ret = [ret; mean(M(row, :))];
    end
endfunction