s dist_to_o dist_to_via via dist_from_via o
urn:a
2
1
urn:g
1
urn:l
urn:a
2
1
urn:g
1
urn:i
urn:a
2
1
urn:g
1
urn:k
urn:a
2
1
urn:g
1
urn:j
urn:a
2
1
urn:g
1
urn:h