-> The insertion of :  [ 0 -1 -1 0 ]  causes a face to split.
-> The insertion of :  [ 0 -1 0 1 ]  causes a face to split.
-> The insertion of :  [ -1 0 0 -0 ]  causes a face to split.
-> The insertion of :  [ 0 -0 1 0 ]  causes a face to split.
The arrangement size:
   |V| = 5,  |E| = 8,  |F| = 5
-> The removal of :  [ 0 -1 0 -0 ]  causes two faces to merge.
The arrangement size:
   |V| = 5,  |E| = 7,  |F| = 4
