echo 'digraph G { concentrate = true; ' > try.dot
cat try.txt | perl -lane '$F[2] =~ s/:000//g; $F[2] =~ s/:/ -> /g; $F[2] .= ";"; print $F[2] if $F[2] =~ /->/' >> try.dot
echo '}' >> try.dot
dot -Tps -o try.ps try.dot 

##</code><code>##

1 => 001:000:000
2 => 001:002:000
3 => 001:003:000
4 => 001:003:004
5 => 001:002:005