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We have EchoArea with links from zone1 & zone2. Echo->useAka with
zone2. Defined by "-a
Program algorythm:
Examples:
a) msg comes from z1. for z1 links we sending seen-bys with z2 nodes. but z1 links must clean seen-bys by themselves (this is z2 echo) or download this echo from z1 link. after that seen-bys cleaned and msg forwarded to z2 links. in the msgbase seen-bys from z2 links only.
b) msg comes from z2. forward it to z2 links. then forward to z1 links. seen-bys not cleaned: this is z2 echo and z1 links must clean it by themselves or receive echo from z1 link. store in msgbase with all seen-bys from z1 & z2 nodes.
c) scan works the same: first sending to z2 links, adding to seen-by's z1 links and export to them.