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server1 server2 server3

server1:NY:3600
server2:NY:3600
server3:NY:3600
server4:Boston:3600

"webserver1 server2 server3 webserver4"

server1:NY:3600
webserver1:NY:3600
...
server3:NY:3600
webserver4:NY:3600
server4:Boston:3600

#!/usr/bin/perl
# stuff
...
        }
    }
}