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p→next==NULL p==NULL p→next=head p=head
head==NULL head->next==NULL head!=NULL head->next==head
head=NIL head->next=NIL head->next=head head<>NIL
p->next==head p->next==NULL p==NULL p==head
first==NULL first->1ink==NULL first->link==first first!=NULL
P->link=head P->link=null P=null P=head
p->next==NULL p==NULL p->next=head p=head
head=NULL head->next=NULL head->next=head head!=NULL
head==NULL head->next==NULL head->next!=NULL head!=NULL
p→next==NULL p==NULL p→next=head P=head
head==0 head->next==0 head->next==head head!=0
head=NULL head->next=NULL head->next=head head<>NULL