mb event system 4 Sections EventSystems Doc
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Def mapfilter(f;P;L) == map(f;filter(P;L))

is mentioned by

Def da-outlinks(da;i)
Def == mapfilter(k.da-outlink-f(da;k);k.has-src(i;k);fpf-dom-list(da))
[da-outlinks]

In prior sections: mb list 2 mb event system 3

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mb event system 4 Sections EventSystems Doc