please generate a varaint program of ```\n int a = 0; int b = 0; int c = 0;struct S0\n{ int f0; };\nstruct S1\n{\n    struct S0 f0;\n};\nstruct S1 x = { {0} };\nstruct S1 y = { {1} };\n\nstatic void\nfoo (struct S0 p)\n{\n    struct S0 *l = &y.f0;\n    *l = x.f0;\n    if (p.f0)\n    {\n        *l = *l;\n    }\n}\n\nint\nmain ()\n{\n    foo(y.f0);\n    printf(\"%d\\n\", y.f0.f0); //``` by changing a type of one of the variables in {a.b,c} to "long" The letter f should appear at least 41 times.
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