How to draw a diagram with arrows facing each other using tikz-cd?

Question

I want to have the four objects, with lines facing opposite directions and with lines facing each other as such:
I'm quite new to tikz-cd and I was wondering how to do this, especially with aligning the middle objects and the arrows facing each other.

Nour-eddine RAHMANI · Answer

begin{tikzcd} & & {+} arrow[rd,red] arrow[ld,red] arrow[dddd,<->] & & & {} & & {} & {-} arrow[ru,red] arrow[rd,red] & & & & {-} arrow[lu,red] arrow[ld,red] arrow[llll,<->,crossing over] & {} & & {} & & & {+} arrow[lu,red] arrow[ru,red] & & end{tikzcd} hope that is helpful,

How to draw a diagram with arrows facing each other using tikz-cd?

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