47196436 47723284 name1 1.77273

42672249 52856963 name2 1.06061
52856963 430695 name2 1.16667

55094959 380983 name3 1.55613

17926380 55584836 name4 1.02461
3213456 34211 name4 1.11
54321 34211 name4 1.23

47196436 47723284 name1
42672249 52856963 430695 name2
55094959 380983 name3
17926380 55584836 3213456 34211 54321 name4

awk '{ x[$3]=x[$3] " " $2; }
END {
   for (k in x) print k,x[k] >"OUTPUT1";
}' ccc.txt

$ perl -ane '$h{$F[2]} .= " ".$F[0]." ".$F[1];
    END {
        for $k (sort keys %h) {
            print $_," " for grep {!$seen{$_}++} split(" ",$h{$k});
            print "$kn";
        }
    }' file

47196436 47723284 name1
42672249 52856963 430695 name2
55094959 380983 name3
17926380 55584836 3213456 34211 54321 name4

awk '$3 != prev {if (NR != 1) print prev; prev=$3; delete a};
!($1 in a){a[$1]++; printf "%s ", $1};
!($2 in a){a[$2]++; printf "%s ", $2};
END {print prev}' ccc.txt
47196436 47723284 name1
42672249 52856963 430695 name2
55094959 380983 name3
17926380 55584836 3213456 34211 54321 name4

47723284 47196436 name1
42672249 430695 52856963 name2
380983 55094959 name3
34211 55584836 17926380 54321 3213456 name4