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I wanted to enclose a pdf-file, but, as far as I understand, this format doesn't go :-(

Let me continue 
So, the trick is as follows:
(1) In collocations «один/одна/одно + a noun» the two parts (a numeral and a noun) fully agree. It means that when you decline, you decline the whole...

It has nothing to do with 'time period' or 'transport'. This is about the collocation of nouns with numbers, which I would recommend you to divide into 3 groups: (1) 'one' plus a noun; (2) 'half, 2,...

Hi! I can send you a pdf-file. Where to?