Assertion: node's sign | /r/CapableOf | indicate direction
Facets:
Source sentences:
text: Again, given two nodes u and v , if there is a flow of 5 units from u to v , and another flow of 3 units from v to u , this is equivalent to a net flow of 2 units from u to v , or a net flow of −2 units from v to u (so sign indicates direction)