zi-end
XR-start
zk-zi
TS-zk
zw-vl
zk-zw
end-po
ws-zw
TS-ws
po-TS
po-YH
po-xk
zi-ws
zk-end
zi-XR
XR-zk
vl-TS
start-zw
vl-start
XR-zw
XR-vl
XR-ws