The phrase "a series of extra" is correct and usable in written English.
It can be used when referring to multiple additional items or elements that are not part of the main set or group.
Example: "The report included a series of extra recommendations that were not initially discussed in the meeting."
Alternatives: "a number of additional" or "a collection of supplementary".
Press more firmly and a series of electrodes around the display knows about it, showing a series of extra menu options.
Earnings were weighed down by a series of extra charges, including an additional £1.5 billion, or $2.3 billion, charge in the three months through Dec. 31 for inappropriately selling insurance to customers.
We ran a series of extra measurements using our proof-of-concept prototype.
It includes a series of extra elements (anchors) that are attached to conventional steel strips.
In premium accounts you will get a series of extra features like billing mechanism (think party fees, conferences,..), hosting,….
As innovation in the life sciences brings about a series of extra considerations that need to be addressed, we will briefly list some of these issues in the second part.
The US believed that Pakistani troops were responsible for a series of extra-judicial killings in the Swat Valley and adjoining tribal belt, but decided not to comment publicly on the issue.
Strawson contends that rather than appealing to a series of extra-semantic conventions to account for the possibility of speech acts, we explain that possibility in terms of our ability to discern one another's communicative intentions.
What should you do if you think you have wrapped up a deal with a client for a certain amount, but then the client asks for a series of extras - usually over a period of time rather than all at once?
5 6 Surprisingly, a series of extra-gastric and even extra-digestive diseases, including haematological disorders such as idiopathic thrombocytopenic purpura and iron deficiency anaemia, cardiovascular diseases, as well as neurological disorders are associated with H pylori. 7 On a global scale, H pylori is the most infectious human pathogen, affecting about 50% of the population.
Last but not least, Nokia has been working on a series of additional Camera Extras in an attempt "to upgrade the core camera experience".
