echo 'digraph {

"Charizard" -> "Charmeleon" [taillabel = "Evolves into"]
"Charmander" -> "Charmeleon" [taillabel = "Evolves from"]
"Charmeleon" -> "Charmander" [taillabel = "Evolves into"]
"Charmeleon" -> "Charizard" [taillabel = "Evolves from"]
}' | dot -Tsvg > output.svg