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By sheer curiosity, i investigated what kind of dual primary Ghost-types we're missing. They are:
>Ghost/Water
>Ghost/Electric
>Ghost/Ice
>Ghost/Rock
>Ghost/Normal
>Ghost/Fighting
>Ghost/Bug
>Ghost/Psychic
>Ghost/Steel
And i shall repeat myself: dual PRIMARY Ghost-types. Hence why i'm not counting Shedinja or Honedge
But if we consider Ghost as secondary type, then it's just Rock/Ghost, Flying/Ghost and Fairy/Ghost missing
