no less than
(이)나 indicates that the number or amount of something is much higher or more than expected, or it is at a level higher than what is generally considered normal. It corresponds to 'as many as' or 'no less than' in English. When added to words ending in a vowel, 나 is added, and when added to words ending in a consonant, 이나 is added.
Comparison:
While the particle 밖에 indicates that a number or amount is less than expected or doesn't meet a general standard, (이)나 indicates that a number or amount is more than expected or exceeds a general standard. Depending on the perspective, a certain quantity can be viewed as either smaller or larger than expected, and thus 밖에 and (이)나 can be used to express such views.
It expresses that the amount of something is much more than expected or higher than the standard.
이나 is added before a counter ending in a consonant
나 is added before a counter that ends in a vowel
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