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##Unspecified, external entities
##unspecified external entities message outside from
##When an arrow has no source or destination entity specified it appears to come from outside the chart.##If you use the pipe symbol '|' then the unspecified entity is just besides the target.##If you really want to be specific about the location use the 'end after' or 'start before' clauses.
a: Client;
b: Server;
c: Backend;
->a: Hit;
a->b: Request;
b->c: Query;
c->c: Lookup;
a<-b<-c: Reply;
a<->c: Direct Query;
<-a:Back;
---;
a->b-|: Goes to out there;
|->c-d: Comes from out there;
->d start before b:
Start further before
[arrow.starttype=dot];
---;
a->b: Trigger Msg;
b-> end after b;
b-> end after b +10;
b-> end after b +20;
---;
b<- start before b;
b<- start before b +10;
b<- start before b +20;
b->a: We got them all;
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