If Costa Rica goes with Thailand, Cuba goes with Puerto Rico, and the Netherlands go with Yugoslavia, what country would the Ivory Coast go with?

Mansi is a language of a Siberian tribe and has about 3000 speakers. Here some number in the Mansi language:
8: nollow, 15: atxujplow, 49: atlow nopel ontellow, 50: atlow, 99: ontelsat ontellow, 555: xotsatn xotlow nopel at, 900: ontellowsat, 918: ontellowsat nollowxujplow.

What is the meaning of the following words: atsatn at, nolsat nopel xot, ontellowsatn ontellowxujplow? And how to say 58, 80, 716 in the Mansi language?

Problem Language Olympiade 2005

How can you put (without using glue or something like that) ten nails on the head of a standing nail? The final construction should be stable.