There are a lot of variations in the original ContextD triggers, which could be caught with more general patterns.
There are a lot of variants of geen (e.g. geen aanwijzingen voor, geen last van), but there is also geen itself, which would already match all of its variants...
We could match on the lemma of a token, such that e.g.
"geen teken van", "geen tekenen van", "geen tekens van" will be caught in one rule
"vertoonde geen", "vertoont geen" will be caught in one rule
There's a lot of variants of "als de/een [bron/oorzaak/reden] van/voor" which could be caught in one rule (e.g. by optionally matching any token)
There are a lot of variations in the original ContextD triggers, which could be caught with more general patterns.