def add(v): for i in now: v=min(v,v^i) if v!=0: now.append(v) now=[] n,m=map(int,input().split()) mask=(2**n)-1 add(0) add(mask) for i in range(m): a=list(map(lambda x:int(x)-1,input().split())) tmp=0 for i in a[1:]: tmp|=1<