1. A method comprising: concatenating one or more electrical digital signals representing binary expressions of individual ones of characters of a first character expression in a first binary string, said characters of said first character expression representing a first numerical value of a first numerical expression represented by a concatenation of said individual ones of characters of said first character expression, at least one of said individual characters of said first character expression representing a digit value having exactly one of three or more possible unique values, said first numerical value comprising a sum of products, at least one of said products comprising one of said digit values multiplied by a positional value associated with a position of said digit value in the first numerical expression; concatenating one or more electrical digital signals binary expressions of individual ones of characters of a second character expression in a second binary string, said characters of said second character expression representing a second numerical value of a second numerical expression represented by a concatenation of said individual ones of characters of said second character expression, at least one of said individual characters of said second character expression representing a digit value having exactly one of three or more possible unique values, said second numerical value comprising a sum of products, at least one of said products comprising one of said digit values multiplied by a positional value associated with a position of said digit value in the second numerical expression; and determining a relationship between said first and second character expressions based, at least in part, on said first and second binary strings.