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++t->a (*t).a++ t->a++ t++->a
p=&a; p=data; p=&data, *p=data;
p=&a; p=data; p=&data; *p=data;
q=&data.m; *q=data.m; q=(struct sk*)&data.m; q=(struct sk*)data.m;
q=&data.m; *q=data.m; q=(struct sk*)&data.m; q=(struct sk*)data.m;
q=&data.m; *q=data.m; q=(struct sk*)&data.m; q=(struct sk*)data.m;
(* p).data (* p).a p->data data. a
p=&datn; *p=datn; p=(struct sk*)&datn; p=(struct sk*)datn: