%!PS

% begin included library code
% see https://codeberg.org/Firedrake/postscript-libraries/
/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

/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


% end included library code

/oddoneout {
    3 dict begin
    /ct 0 def
    {
        /s exch def
        1 1 s length 1 sub {
            /i exch def
            s i 1 sub get s i get gt {
                /ct ct 1 add def
                exit
            } if
        } for
    } forall
    ct
    end
} bind def

(oddoneout) test.start
[(abc) (xyz) (tsu)] oddoneout 1 eq test
[(rat) (cab) (dad)] oddoneout 3 eq test
[(x) (y) (z)] oddoneout 0 eq test
test.end