1.  a
    ava
    avava
    avavava
    avavavava................

        a(va)*

        S -> aA
        A -> eps | vaA

        S -> Aa
        A -> eps | Ava

        S -> a | avS

        S -> a | Sva

        S -> a | SvS


        f(1, 432, 15, "abc")


2.  ap
    apap
    apapap
    apapapap
    apapapapap....................

        (ap)+

        S -> apS | ap

        S -> Sap | ap

        S -> Aap
        A -> eps | Aap

        S -> apA
        A -> eps | apA


        int i = 3;
        i = 4;

3. helyes zárójelezések nyelve
    nc
    ncncncncncncncnc
    nnnccc
    ncnncnnncccncnccnc

        S -> nScS | eps

        S -> nSc | SS | nc

        S -> nSc | SS | eps