HKX
HKX is a variant in which during HKF2L, you ensure that the DF edge is oriented, so the number of HKOLL algs is halved. Only the HKOLLs with an even number of oriented edges are needed. Then HKPLL is done.
HKX is a variant in which during HKF2L, you ensure that the DF edge is oriented, so the number of HKOLL algs is halved. Only the HKOLLs with an even number of oriented edges are needed. Then HKPLL is done.