americanMapping constant
This is a default mapping of the 26 letters used in US English.
Implementation
static const Map<int, int> americanMapping = {
$A: $nul,
$B: $1,
$C: $2,
$D: $3,
$E: $nul,
$F: $1,
$G: $2,
$H: $nul,
$I: $nul,
$J: $2,
$K: $2,
$L: $4,
$M: $5,
$N: $5,
$O: $nul,
$P: $1,
$Q: $2,
$R: $6,
$S: $2,
$T: $3,
$U: $nul,
$V: $1,
$W: $nul,
$X: $2,
$Y: $nul,
$Z: $2
};