%!PS

% begin included library code
% see https://codeberg.org/Firedrake/postscript-libraries/
/keys { % dict -> array of dict keys
    [ exch
      {
          pop
      } forall
    ]
} bind def

/deepcopy {
    2 dict begin
    /a exch def
    a type /dicttype eq {
        <<
            a keys {
                /k exch def
                k
                a k get deepcopy
            } forall
        >>
    } {
        a type /arraytype eq {
            [
                a {
                    deepcopy
                } forall
            ]
        } {
            a type /stringtype eq {
                a dup length string cvs
            } {
                a
            } ifelse
        } ifelse
    } ifelse
    end
} 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

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

/apop.left { % [a b c] -> [b c] a
    dup 0 get exch
    [ exch aload length -1 roll pop ] exch
} 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

/apush.right { % [a b] c -> [a b c]
    exch
    [ exch aload length 2 add -1 roll ]
} bind def


% end included library code

/word2map {
    2 dict begin
    /m 0 dict def
    {
        /c exch def
        c 65 ge c 90 le and {
            /c c 32 add def
        } if
        c 97 ge c 122 le and {
            m c known {
                m c m c get 1 add put
            } {
                m c 1 put
            } ifelse
        } if
    } forall
    m
    end
} bind def

/wordstickers {
    12 dict begin
    word2map /w exch def
    /t w deepcopy def
    /stick exch
    [ exch
      {
          /f exch word2map def
          f keys {
              /c exch def
              t c known {
                  t c undef
              } if
          } forall
          f
      } forall
    ] def
    t length 0 gt {
        0
    } {
        /stack [ [ w 0 ] ] def
        {
            stack apop.left /st exch def /stack exch def
            st 0 get length 0 eq {
                st 1 get
                exit
            } {
                /n st 1 get 1 add def
                stick {
                    /sti exch def
                    /sp st 0 get deepcopy def
                    /v false def
                    sti keys {
                        /l exch def
                        sp l known {
                            /v true def
                    /p sp l get sti l get sub def
                            p 0 gt {
                                sp l p put
                            } {
                                sp l undef
                            } ifelse
                        } if
                    } forall
                    v {
                        /stack stack [ sp n ] apush.right def
                    } if
                } forall
            } ifelse
        } loop
    } ifelse
    end
} bind def

(wordstickers) test.start
[(perl) (raku) (python)] (peon) wordstickers 2 eq test
[(love) (hate) (angry)] (goat) wordstickers 3 eq test
[(come) (nation) (delta)] (accomodation) wordstickers 4 eq test
[(come) (country) (delta)] (accomodation) wordstickers 0 eq test
test.end