@manwar The last one in your examples is wrong, it ends at (2,2), so the answer is false...

Anyway, after the nice cup of coffee in my Monday morning, I got to the following #RakuLang #OneLiners -- the first making good use of Raku's nice #RegEx #RegExen #RegExes and the second, of the Bag type...

Power String: ```
m:g/(.)[$0*]/.list».Str».chars.max
```
Meeting Point : ```
.comb.Bag.&{.<L> == .<R> && .<U> == .<D>}
```