echo 'digraph {

"Mika" -> "Mika" [taillabel = "Sister of"]
"Yui" -> "Mika" [taillabel = "Sister of"]
"Mika" -> "Mika" [taillabel = "Sister of"]
"Yui" -> "Mika" [taillabel = "Sister of"]
"Ayumi" -> "Yui" [taillabel = "Sister of"]
"Mika" -> "Yui" [taillabel = "Sister of"]
}' | dot -Tsvg > output.svg