Cascade for [4], [2, 2, 2, 2]

Singularity types \(K^2\) Orders of local
fundamental groups		 Local indices Index
[4], [2, 2, 2, 2] 5 4, 5 2, 1 2
\(\downarrow\)
[3], [2, 2, 2] 16/3 3, 4 3, 1 3
\(\downarrow\)
[2], [2, 2] 6 2, 3 1, 1 1