i2 : PP3 = projectiveSpace 3
o2 = a GKM variety with an action of a 4-dimensional torus
o2 : GKMVariety
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i3 : cellOrder PP3
stdio:3:1:(3): error: no cell order defined on this moment graph
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i4 : V = (momentGraph PP3).vertices
o4 = {set {0}, set {1}, set {2}, set {3}}
o4 : List
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i5 : P = poset(V, {{V_0,V_1},{V_1,V_2},{V_2,V_3}})
o5 = P
o5 : Poset
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i6 : cellOrder(momentGraph PP3, P)
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i7 : cellOrder PP3
o7 = P
o7 : Poset
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