The phrase "and the only primary" is grammatically correct and can be used in written English.
It can be used when emphasizing that something is the sole primary example or instance of a particular category or type.
Example: "This is the only primary source of information we have on the subject, and the only primary document that supports our findings."
Alternatives: "the sole primary" or "the exclusive primary".
The inverted repeats contain two short transcription units, transcribed from opposite strands: TU2 consisting of COX3 and tRNA-Lys, and TU3 – the only primary transcript containing only tRNAs (five).
Kent and Medway is not the only primary care trust involved in introducing new criteria for specific medical conditions.
It is slightly sinister seeing such a tiny tot surrounded by push-up bras and hot pants, and she is far from the only primary schooler in the arena.
Seaview Primary School was initially located in a mansion that was donated to the County of Angus and through the 1950s was the only primary school in Monifieth.
Their ethnic identity is uncertain; although their ethnonym identifies them as Romanians (who were called Vlachs in the Middle Ages), archeological evidence and the Hypatian Chronicle (which is the only primary source that documents their history) suggest that they were a Slavic people.
At that time, a two-room shepherd's cottage housed the only primary school and no resources were available for a secondary school.
Only two of the sixteen limbal melanomas metastasised, whereas two of the four bulbar, all three tarsal and the only diffuse primary tumour caused metastatic disease.
Nonsmokers with lung cancer were excluded from the study and only primary lung cancer cases with the following pathological diagnosis were included: adenocarcinoma, squamous cell cancer, small cell cancer, and nonsmall cell cancer (generally large cell or bronchoalveolar subtypes).
All re-hospitalizations due to either rehabilitation, medical or surgical complications were excluded based on the original medical records and thus only primary hospitalizations after the initial injury were included into the study.
