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nextent
From Quake Wiki
Function: nextent
entity nextent(entity e)
Returns entity that is just after e in the entity list. Useful to browse the list of entities, because it skips the undefined ones. Function: find
entity find (entity start, .string field, string match) start = begining of list to search (world, for the begining of list) field = entity field that must be examined (ex: targetname) match = value that must be matched (ex: other.target) returns the entity found, or world if no entity was found.
Searches the server entity list beginning at start, looking for an entity that has entity.field = match.
Example: find the first player entity
e = find( world, classname, "player");
Take care that field is a name of an entity field, without dot, and without quotes.