Nothing
Code
create_graph() %>% add_n_nodes(n = 2, type = "type_a", label = c("a_1", "a_2")) %>%
add_edge(from = 1, to = 2, rel = "a") %>% add_reverse_edges_ws("b")
Condition
Error in `add_reverse_edges_ws()`:
! The graph contains no selection of edges.
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