defaultMapping constant
This is a default mapping of the 26 letters used in US English.
Implementation
static const Map<int, int> defaultMapping = {
$A: $0,
$B: $1,
$C: $3,
$D: $6,
$E: $0,
$F: $2,
$G: $4,
$H: $0,
$I: $0,
$J: $4,
$K: $3,
$L: $7,
$M: $8,
$N: $8,
$O: $0,
$P: $1,
$Q: $5,
$R: $9,
$S: $3,
$T: $6,
$U: $0,
$V: $2,
$W: $0,
$X: $5,
$Y: $0,
$Z: $5
};