I would say that the first thing to do here is to "flatten" the array - having the multiple dimensions makes this a lot more complicated than it needs to be. So rather than creating $conteudo like this.
I think you should update counter inside foreach ($col as $cell) { } so it will count elements of the inner arrays and also move decalration of there. If (!is_int($i/2)) { print '' }.
I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.