Each slot is different, but you typically need at least five matching symbols to form a cluster.
https://debate.socialism.nl/forum/showt ... tid=178341
http://forum.spolokmedikovke.sk/viewtop ... &t=1067368
https://gravatar.com/shyhonestlyb72856faf6
https://debate.socialism.nl/forum/showt ... tid=242409
https://mahayu.link/forum.php?mod=viewt ... 472&extra=
viewtopic.php?f=28&t=171002
https://debate.socialism.nl/forum/showt ... tid=297929
viewtopic.php?f=17&t=241946
http://forum.spolokmedikovke.sk/viewtop ... &t=1175505
https://debate.socialism.nl/forum/showt ... tid=276147
http://forum.fretky.cz/info-f46/hogyan- ... 76172.html
http://oldsite.giessen46ers.de/fantalk/ ... 1&t=223626
http://foro.goatenerife.es/viewtopic.php?f=29&t=37814