xx-xh
vx-qc
cu-wf
ny-LO
cu-DR
start-xx
LO-vx
cu-LO
xx-cu
cu-ny
xh-start
qc-DR
vx-AP
end-LO
ny-DR
vx-end
DR-xx
start-DR
end-ny
ny-xx
xh-DR
cu-xh