What Pokemon types don’t exist?

What Pokemon types don’t exist?
Below is the full list of unused Pokémon type combinations, according to Pokémon Database:

Normal/Ice.
Normal/Poison.
Normal/Bug.
Normal/Rock.
Normal/Ghost.
Normal/Steel.
Fire/Grass.
Fire/Fairy.

Below is the full list of unused Pokémon type combinations, according to Pokémon Database:
  • Normal/Ice.
  • Normal/Poison.
  • Normal/Bug.
  • Normal/Rock.
  • Normal/Ghost.
  • Normal/Steel.
  • Fire/Grass.
  • Fire/Fairy.
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