* /|\ / | \ / | \ / | \ / 2 \ / / \ \ / / \ \ / 1 2 \ / \ 1 3 /|\ /|\ / | \ / | \ 1 2 3 1 | 3 / \ /|\ | 1 2 1 2 3 2 / \ / \ 1 2 ___________ | | | _______1 _2 _____3 | | | | | | | | _1 2 ___3 1 2 1 _2 3 | | | | | | | 1 2 1 2 3 1 2 _____________________ | | | _____1_____ _2_ ___3___ | | | | | | | | _1_ 2 __3__ 1 2 1 _2_ 3 | | | | | | | 1 2 1 2 3 1 2
________________ | | | 1_____ 2_ 3_____ | | | | | | | | 1_ 2 3___ 1 2 1 2_ 3 | | | | | | | 1 2 1 2 3 1 2
111111223333 112333121223 12 123 12
1 1.1 1.1.1 1.1.2 1.2 1.3 1.3.1 1.3.2 1.3.3 2 2.1 2.2 3 3.1 3.2 3.2.1 3.2.2 3.3