View Compilation Error

0_0_39304446_30977.cpp: In function 'int main()':
0_0_39304446_30977.cpp:8:254: error: expected ';' before ':' token
    8 | using namespace std;list<int>a;list<int>::iterator it;int main(){int t,n;cin>>t;while(t--){cin>>n;a.clear();int k=2;for(int i=1;i<=n;i++){a.push_back(i);}while(a.size()>3){int cnt=1;for(it=a.begin();it!=a.end();){if(cnt++%k==0){it=a.erase(it);}else it++: }k=(k==2?3:2);}for(it=a.begin();it!=a.end();it++){if(it!=a.begin())printf(" ");printf("%d",*it);}printf("\n");}return 0;}
      |                                                                                                                                                                                                                                                              ^
      |                                                                                                                                                                                                                                                              ;