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Select the right subset (Posted on 2020-04-10) Difficulty: 4 of 5
To list the 4 countries - CHINA, CHAD,CANADA & CHILE you need only 8 distinct letters: A,C,D,E,H,I,L & N.

Find a 10-member subset of ABC such that enables to create the longest list of currently existing countries.

The following restrictions apply:
- Only UN current official members
- English spelling of names e.g. Spain, not Espana
- No abbreviations!

Google's list https://www.un.org/en/member-states/ recommended as database.

No Solution Yet Submitted by Ady TZIDON    
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Comments: ( Back to comment list | You must be logged in to post comments.)
re: max found by computer Comment 3 of 3 |
(In reply to max found by computer by Charlie)

by the way, the eight letters in common, aeinorgm, between the two lists, can produce 7 countries: armenia, georgia, iran, niger, nigeria, oman and romania.
  Posted by Charlie on 2020-04-10 11:45:01

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