Looking on the internet deeply has found these results:

which is the most popular phrase on the web.

in which 11,300,000,000 results on the web	which 16,450,000,000 results on the web More popular!
Some examples and use cases from the internet:	Some examples and use cases from the internet:
This world in which farmers starve miserably... That was the environment in which Mahayana Buddhism developed. The process in which one consciousness enters another. Condition in which evaporation always exceeds precipitation. Thankfully in which risk One in which grief replaced frenzy. Country in which business lines operate. free enhancement approaches can be purchased.	One which I have created for romantic relationships. It constitutes a delicate compromise which was difficult to achieve but which is well Audio, which controls your outside mikes which are here. balanced. A limit value above which exposure should not occur and which is related to a 15 The Commission has published a recommendation on auditor independence which sets out the conditions under which such services are still allowed. Humanity has always feared that which is different. A legal duty therefore exists which must be respected.

in which

11,300,000,000 results on the web

which

16,450,000,000 results on the web

More popular!

One which I have created for romantic relationships.
It constitutes a delicate compromise which was difficult to achieve but which is well
Audio, which controls your outside mikes which are here.
balanced.
A limit value above which exposure should not occur and which is related to a 15
The Commission has published a recommendation on auditor independence which sets out the conditions under which such services are still allowed.
Humanity has always feared that which is different.
A legal duty therefore exists which must be respected.