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Worst dual typings
Fairy/Fighting (super effective against steel but also weak to it and 20 steel types are not weak to fighting)
Ice/Rock
Ice/Steel
Grass/Ice
Ice/Fairy
Grass/Bug
Rock/Steel
Psychic/Grass
Fire/Rock
Ghost/Psychic
Ice/Dark
Ground/Rock
Fighting/Ice
Ice/Fire
Ice/Bug
Psychic/Rock
Grass/Flying
Grass/Fairy
Fairy/Ground
Fairy/Fire