Three current-carrying wires 2

As shown above, three infinitely long current-carrying wires L , M and N are fixed on the $xy$ -plane, all parallel to the $y$ -axis. The distances from the $y$ -axis are $2r$ , $r$ and $r$ , respectively. The intensities of the currents flowing in the wires L , M and N are $2I$ , $2I$ and $I$ , respectively. The direction of the electric current in L is $-y$ direction and the directions of the electric currents in M and N are both $+y$ direction. Let $F_L, F_M$ and $F_N$ denote the sum of the magnetic forces acting on each of the segments (of the same length) of $L,$ $M$ and $N,$ respectively. Then what is the ratio $\lvert{F_L}\rvert:\lvert{F_M}\rvert:\lvert{F_N}\rvert?$