pub fn letters_len(&self) -> usize {
        (&self.graph)
            .node_references()
            .map(|(_, word)| word.len())
            .sum()
    }
/// Return the total number of letters
Return the total number of letters
Return the total number of letters
pub fn letters_len(&self) -> usize {
        (&self.graph)
            .node_references()
            .map(|(_, word)| word.len())
            .sum()
    }
pub fn letters_len ( & self ) -> usize { ( & self . graph ) . node_references ( ) . map ( | ( _ , word ) | word . len ( ) ) . sum ( ) }
Return the total number of letters
Return the total number of letters
&self
&self