Transition pairs joined,left and left,joined are now transformed into single meta-transitions "joined_and_left" and "left_and_joined" respectively. These are described as "joined and left", "left and rejoined".
Treat consecutive sequences of transitions as repetitions, and handle any arbitrary repetitions of transitions:
...,joined,left,joined,left,joined,left,...
is canonicalised into
...,joined_and_left, joined_and_left, joined_and_left,...
which is truncated and described as
... , joined and left 3 times, ...
This also works if there are multiple consecutive sequences separated by other transitions:
..., banned, banned, banned, joined, unbanned, unbanned, unbanned,...
becomes
... was banned 3 times, joined, was unbanned 3 times ...
lukebarnard
82d6805a71