alphabet constant
Implementation
static const alphabet = {
62: '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ',
95: (' !"#\$%&\'()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ'
r'[\]^_`abcdefghijklmnopqrstuvwxyz{|}~')
};