for itemAL in AL:
        for itemAR in AR:
            if  itemAR[1] == itemAL[1]:
                if itemAL[0] >= itemAR[0]:
                    corners.append(itemAR)
                    print('item',itemAL)
                    for e in range(itemAL[0]-itemAR[0]):
                        edges.append(AR[0]+e,AR[1])
                        B_edges.append(AR[0]+e,AR[1]+1)
                    outcome = walls(B_edges, edges, warehouse.walls, warehouse.targets)
                    if outcome is not None:
                        taboo.append(outcome)