8 faces:
Face no. 0: Unbounded.
Face no. 1: 5.2 3 --> 2.8 3 --> 4 1 --> 5.2 3
Face no. 2: 6.1 4.5 --> 5.2 6 --> 2.8 6 --> 1.9 4.5 --> 2.8 3 --> 5.2 3 --> 6.1 4.5
Face no. 3: 1.9 4.5 --> 1 3 --> 2.8 3 --> 1.9 4.5
Face no. 4: 1.9 4.5 --> 2.8 6 --> 1 6 --> 1.9 4.5
Face no. 5: 5.2 6 --> 4 8 --> 2.8 6 --> 5.2 6
Face no. 6: 5.2 6 --> 6.1 4.5 --> 7 6 --> 5.2 6
Face no. 7: 7 3 --> 6.1 4.5 --> 5.2 3 --> 7 3
