alias: shortcut command matching show shadowing works properly (issue3104) An alias for 'log' was stored in the same command table as '^log|history'. If the hash function happens to give the latter first, the alias is effectively ignored when matching 'log'.

Ancestors of 5
4 2 0 
Ancestors of 6 and 5
3 4 2 1 0 
Ancestors of 5 and 4
4 2 0 

Descendants of 5
7 8 
Descendants of 5 and 3
6 7 8 
Descendants of 5 and 4
5 7 8