scanner
    simple = $+;
    digit = "0123"; //The attribute should be "RK". (note: character $0 is ascii 48)
    alternativeDigit = $0 .. $3; //Note: ascii 48, ...
    anotherAlternativeDigit = 0 .. 3; //Note: ascii 0, ...
    anotherAlternativeDigitAgain = 0 | 1 | 2 | 3; //Note: ascii 0, ...
    endOfFileCharacter = 256;
    space = 32 [noKeep]; //The attribute should be "R".
    lineEnd = 10 [noKeep];
    all = "0123abc;+-/" [read keep] | space | lineEnd; //Space and lineEnd should be "R"; others "RK".
    nonDigit = {all - digit}; //The attributes should be "L" or "" or "K"; i.e., NOT CONTAINING R.
    number = digit+ => Number; //
    Comment =
        ($/ [noKeep] {all - $/} #syntaxError: ["// is a comment, / alone is not valid"])
      | ($/ [noKeep] $/ [noKeep]
                (all [noKeep] - lineEnd [noKeep])*
            (
                lineEnd [noKeep] |
                {endOfFileCharacter}
            )
        );

    //The following are ROOT building semantic actions; i.e., TOKEN BUILDING.   
    //Also, note that parameters should be characters, integers, or strings depending
    //on whether their labels are #walkCharacter: #walkInteger:, or #walkString:.
    fsm1 = $a => "bird";   //This one should create semantic transition #buildToken: with parameters containing "bird" (NOT A TOKEN).
    fsm2 = $b => #buildBirdRoutine:with: [1 2];  //This one should create semantic transition #buildBirdRoutine: with parameters containing integers 1 and 2.
    fsm3 = $c => #between:and: [10 20];  //This one should create semantic transition #between:and: with parameters containing integers 10 and 20.
    fsm4 = $d => #testing;  //This one should create semantic transition #testing with parameters consisting of an empty collection.

    //The following are NON-ROOT building semantic actions
    fsm5 = $e [node] #normalIncludes:and: [30 40];  //This one should create semantic transition #normalIncludes:and: with integer parameters 30 and 40.
    fsm6 = $f [node] #normalIncludes: [50];  //This one should create semantic transition #normalIncludes: with parameters consisting of integer 50.
    fsm7 = $g [node] #normalAction;  //This one should create semantic transition #normalAction with parameters consisting of an empty collection.