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Interesting. Are {} supposed to represent mathematical set?

#define j(n,r,i) A*n=R(r[i].a);//
#define E X("syntax error\n",1)//
#define d(n) A*n(A*x,A*y)//
#define k(d,v) D(d);e v;//
#define F X("fail\n",-1)//
#define h(n) A*n(A*x)//
#include <stdlib.h>//
#define u(n) n[0].l//
#include <stdio.h>//
#define w union A//
#define e return//
#define N 5 ...