age[?] title1 title2
Add an edge to the current graph
| Examples:
| age title1 title2 Add an edge from the node with "title1" as title to the one with title "title2"
| age "title1 with spaces" title2 Add an edge from node "title1 with spaces" to node "title2"
| age- title1 title2 Remove an edge from the node with "title1" as title to the one with title "title2"
| age? Show this help