x1=skuP1 says x2=skuP2=skuZ2 to x3=skuP3 via medium x4=skuP4, quoting x5=skuZ1 saying that to x6=skuZ3 via medium x7=skuZ4.
skuZ is used for the left (zunle) cusku, and skuP for the right (pritu) one. Syn. sitsku, but a bit more precise (and with more places to use).