1. If they are in the same category and the same group. Both trademarks are similar.

2. "Serina" and "Urban Serena" are similar. The main parts of these two trademarks are "Serina". During the review, they were similar.

3. "Youlfen" and "Youlfen" must be similar, and the word "er" is a weak word, especially if you add a weak word after or between the two words, this will will be considered approximate.

4., "Ulfen" has a passing probability of 0

"Serina" has a passing probability of less than 10%