Hi. Glad you started posting some code.

Yes, as far as I know, in C, switch is extremely slow when compared to if. I
recommend you use that.

Here's how I would do it.

#declare Value=abs(k) + abs(l);
#if (Value=1) #declare Unstretched = Unstretched1;  #end
#if (Value=3) #declare Unstretched = Unstretched5;  #end
#if (Value=4) #declare Unstretched = Unstretched4;  #end

#if (Value=2)
    #if ((k=0) | (l=0))
     #declare Unstretched = Unstretched3;
    #else
     #declare Unstretched = Unstretched2;
    #end
#end

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