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in the PONS Dictionary

I. which [(h)wɪtʃ] PRON

1. which interrog (one of choice):

which
I really can't tell them apart — which is which?

2. which rel (with defining clause):

which

3. which rel (with non-defining clause):

which
at/upon which ...

4. which rel, after prep:

which

II. which [(h)wɪtʃ] ADJ inv

1. which interrog (what one):

which
which doctor did you see?

2. which rel (used to introduce more info):

which

III. which [(h)wɪtʃ] N Brit

Which?
OpenDict entry

which PRON

which is why ...