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top=top+1;V[top]=x V[top]=x;top=top+1 top=top-l;V[top]=x V[top]=x;top=top-1
top = top+1; V[top] = x; V[top] = x; top = top+1; top = top-1; V[top] = x; V[top] = x; top = top-1;
top=top+1;V[top]=x V[top]=x;top=top+1 top=top-1;V[top]=x V[top]=x;top=top-1