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c Language

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#include <stdio.h>
int main(void)
{
    int a=3,b,c,d=10,e=20,f;

    c= ++a + a++ + a++ + ++a;


    b= ++d + ++d + ++d + ++d;


    f= ++e + --e + e-- + e++;

    printf("%d %d\n",a,c);

    printf("%d %d\n",d,b);

    printf("%d %d\n",e,f);

 return 0;
}

please give the detailed explanation how it works? and what is the output?

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