I'm not OP but I've found a very easy solution to the puzzle.

Here is the solution:<br>```<br> A<br> B C<br>D E F<br> G<br>B C D E<br> F O<br> A D G I<br>C B E H K<br> F D J<br>A E F I L<br> C G K<br> B D<br>A C F H<br> E I<br> D G<br>B E H I<br> F K<br> G<br> C<br>B D F<br> E I<br> H L<br>A C E G<br> F J<br> I<br>A E H K<br> F<br> I<br>B D F<br> G<br>C E I<br> K<br> H<br> F<br> G<br>C H L<br> I<br> K<br>```<br>There is no possible solution that satisfies all the conditions.