Spot the mistake in this sentence: “That is a belief in which we do not believe in.”
The mistake? A prepositional doubling-up (“That is a belief IN which we do not believe IN.”).
Other frequent examples:
“The theory of which we have been informed of.”
“The cousin with whom I went to the beach with.”
No great solutions here – just be vigilant!
Here are two links on the matter:
Jason Blake and Monika Kavalir