L4E is the similar algorithm as roux LSE (last six edges).  The difference is two edges are M2 away from solve because we done OCL in first step. We only us M and U (D) in this step. First, bring the opposite color corner of the OC edge on the D side to the front (see image 1). And if you do M2, the UR/UL edge will be solved. After that, the problem can be solved using the following algorithms. (It is also possible to solve it without using an algorithm)