"certain sets of" is a grammatically correct phrase and can be used in written English.
It is usually used to describe a specific group or category of items that share a common characteristic. Example: The store sells certain sets of tools for woodworking, including saws, chisels, and drills.
It comes down to girls playing with certain sets of toys and boys with others".
In particular, you may hear certain sets of words and break them down wrongly in your head.
Just like certain sets of more ordinary twins, however, these two books are alike only on the surface.
Seymouria had many skeletal characteristics in common with amniotes (reptiles, mammals, and certain sets of their more primitive relatives), but it is not included in this group.
"When we see this activity twice -- large movements of assets in a handful of funds correlated with certain sets of market activity -- we write a letter and say we need to resolve this problem".
On top of it all, the agency needs to consider cost-effectiveness: if certain sets of nodes along the transportation network are much more cost-effective to reinforce than others, then the best defense may not come from allocating resources equitably across the system.
After all, at best these arguments show that certain sets of sentences (beliefs, etc).
However, they can also be used to analyze system behavior under certain sets of conditions.
The weakly closed algebras generated by certain sets of composition operators are shown to be reflexive.
As Dowdall says, "If you make an investment based on certain sets of rules, usually the rules are not changed midstream".
Therefore, certain sets of results from our analysis of major choice and cumulative GPA will allow us to bound the effect of peer quality on major-specific grades.
