grammar
όχι μόνο ... αλλά και ...
This correlative structure adds emphasis by pairing two parallel elements: first a minimum requirement, then an additional point of equal or greater importance. It is very useful in formal writing and argumentation, especially when you want to expand an idea without breaking the sentence into separate parts. Example: "Η έρευνα ήταν όχι μόνο ακριβής αλλά και απολύτως τεκμηριωμένη." Here, both adjectives apply to the same noun in a balanced, emphatic way.
Η έρευνα ήταν όχι μόνο ακριβής αλλά και απολύτως τεκμηριωμένη.
The research was not only accurate but also fully documented.