4LLL
The 4-Look Last Layer involves completing the last layer in four steps or looks. It is an intermediate step between the beginner LBL method and learning full Fridrich. It is generally broken down into 2-look OLL (orientation of edges, followed by orientation of corners) and 2-look PLL (permutation of corners, followed by permutation of edges). Achieving 4LLL requires knowledge of 16 algorithms or 14 excluding mirrors. While progressing from 4LLL to 2LLL a speedcuber will typically learn all 21 PLLs first, to achieve a 3-look last layer. Eventually, learning the final 57 OLL cases will achieve the 2-look last layer used in full Fridrich.
Another possible breakdown is to use 2-look CLL (CO-CP) and 2-look ELL (EO-EP). This can later become three diffrent 3-looks, full CLL and 2-look ELL, 2-look CLL and full ELL but also CO, CPEOLL and EPLL. This last suggestion is the easiest way to archive a 3-look LL, it only uses 26 algorithms in total, the drawback is that the mid step is not of much use when expanding to 2-look.
