Bongard problem 105

In 1967 the Russian scientist M.M. Bongard published a book containing 100 problems. Each problem consists of 12 small boxes: six boxes on the left and six on the right. Each of the six boxes on the left conforms to a certain rule. Each box on the right contradicts this rule. Your task, of course, is to figure out the rule.

1) Numbers^***/*****

New puzzles are published at least once a month on Fridays. Solutions are published after one or more weeks. You are welcome to remark on the difficulty level of the puzzles, discuss alternate solutions, and so on. Puzzles are rated on a scale of 1 to 5 stars. You can check your solutions here.

Bongard problem rule 9

In 1967 the Russian scientist M.M. Bongard published a book containing 100 problems. Each problem consists of 12 small boxes: six boxes on the left and six on the right. Each of the six boxes on the left conforms to a certain rule. Each box on the right contradicts this rule. Your task, of course, is to figure out the rule.

A Bongard problem consists of two groups of 6 images. Each and every of the six images on the left complies wit a certain rule. Each of the 6 images on the right does NOT comply with this rule.

Rule 9^**/*****

New puzzles are published at least once a month on Fridays. Solutions are published after one or more weeks. You are welcome to remark on the difficulty level of the puzzles, discuss alternate solutions, and so on. Puzzles are rated on a scale of 1 to 5 stars. You can check your solutions here.

A European trip

I’m writing this at the end of december, and we are still locked up due to covid-19 restrictions. But nothing prevents us to make a trip on the web.

1) Europe^***/*****
Inspired by the yearly Christmas puzzles of the AIVD, the Dutch intelligence service, here is a European trip:
aacghopz – acinortss – aipzz beeglnoos – aciopt – aëtv ioks – gory – denör – egijnsu ciooprsttu
Which country is missing?

A new puzzle is published at least once a month, but usually every fortnight on Friday morning. You can find the solution to this puzzle here.