%!PS

% begin included library code
% see https://codeberg.org/Firedrake/postscript-libraries/
/all { % [a b] proc -> bool
    1 dict begin
    /p exch def
    true exch
    {
        p not {
            pop false
            exit
        } if
    } forall
    end
} bind def

/test {
    /test.count test.count 1 add def
    {
        /test.pass test.pass 1 add def
    } {
        ( ) print
        test.count (....) cvs print
        (-fail) print
    } ifelse
} bind def

/test.start {
    print (:) print
    /test.pass 0 def
    /test.count 0 def
} bind def

/test.end {
    ( ) print
    test.count 0 gt {
        (Passed ) print
        test.pass (...) cvs print
        (/) print
        test.count (...) cvs print
        ( \() print
        test.pass 100 mul test.count idiv (...) cvs print
        (%\)) print
        (\r\n) print
    } if
} bind def

/values { % dict -> array of dict values
    [ exch
      {
          exch pop
      } forall
    ]
} bind def


% end included library code

/counterify {
    2 dict begin
    /c 0 dict def
    {
        /n exch def
        c n known {
            c n 2 copy get 1 add put
        } {
            c n 1 put
        } ifelse
    } forall
    c
    end
} bind def

/oddletters {
    counterify values { 2 mod 1 eq } all
} bind def

(oddletters) test.start
(weekly) oddletters not test
(perl) oddletters test
(challenge) oddletters not test
test.end