How to make two referencing sub-projection works?

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https://learninghub.kx.com/forums/topic/how-to-make-two-referencing-sub-projection-works

I have below code, which doesn’t work. h and g are 2 projections defined inside f, and they are referencing to each other.

Theorectically, the answer should be:

f[10]=g[10]

=h[8] + 20

=g[5] + 30 + 20

=h[3] + 20 + 30 + 20

=g[0] + 30 + 20 + 30 + 20

=h[-2] +20 + 30 + 20 + 30 + 20

= -2 + 120 = 118

f:{[xF]
 g:{[h;xG] $[xG < 0; xG; h[xG - 2] + 20]}[h]; // doesn't work, as h is not yet defined
 h:{[g;xH] $[xH < 0; xH; g[xH - 3] + 30]}[g];
 g[xF]
 };
f[10];

How to make it works?

2 
f:{[xF] 
    g:{[h;xG] $[xG < 0; xG; h[.z.s; xG - 2] + 20]}; 
    h:{[g;xH] $[xH < 0; xH; g[.z.s; xH - 3] + 30]}; 
    g[h; xF] }; 
f[10];

Another option is to use .z.s to refer to the calling function when calling the other function.