String RobotCar(int[][] L) {
    int x = -1, y, i;
    String R = "", s, z;
    for(int[] A: L){
        y = (i=A[0])+(i>0?1:0)- i / 4  + 1/++A[1];

        s = "	LF		LL 	LFLL		 	L	 	LF			 	F				 	F	LL		  		LFL		 		LLL 	F 		LLFL				 		LLFL	LL		   LL		L LL	F		 LL		FL				 LL		FL	LL		    				 LL				 LL	LL		     LLLFL				 LLLFL	LL		      LLFL		".replace("	","R").split(" ")[x < 0? y : 6 + x + y + 5*(x<y?x:y)];
        z = "";

        for(int c : s.getBytes())
            z = "                                                                      F     R     L".charAt(c)+z;

            R += "F"+(x < y ? s : z);
            x = y;
    }
    return R.replaceAll("(.)(?=.)","$1-");
}