# NOT RUN {
genes=1:200
cells=sample(1:500,30)
data(traj)
k=10
traj_lle = lle::lle(traj[cells,genes],m=2,k)$Y
traj_graph = conn_knn_graph(traj_lle,5)
start=1
cells_ordered = cell_order(traj_graph,start)
# }
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