What are all the theoretical type combos with only one weakness?

Question

Not this
https://pokemondb.net/pokebase/206527/have-listed-dual-type-pokemon-that-have-only-weakness-typewise

Like, what are all the types with only 1 weakness even ones that don't exist.

Comments

https://pokemondb.net/type/dual

> 1 weakness
NORMAL —  (71)
ELECTRIC —  (34)
NORMAL GHOST  (0)
WATER GROUND  (10)
POISON DARK  (5)
BUG STEEL  (7)
GHOST DARK  (3)

That "0" near Normal - Ghost combo indicates that it is unused.

Answer 1

They are:

1) Normal
2) Electric
3) Poison and Dark
4) Bug and Steel
5) Ghost and Dark
6) Normal and Ghost
7) Water and ground

Out of these only ghost and normal hasn't been used.
Hope I helped!
Source : competitive battling

Comments

"Like, what are all the types with only 1 weakness even ones that don't exist."
read

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But isn't the answer correct?

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Unless I'm misinterpreting it, the asker wants all type combos with only one weakness, including combinations with more than two types.

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Hellfire Taco, by "ones that don't exist" I would assume the asker means dual type combos that don't exist specifically  e.g there are no normal-ghost type pokemon. I don't see why they would want to know any more than 2 types.
And the answer is correct hoennsceptile.
Edit - actually I think you're right, otherwise this question would be exactly the same as the one they linked.