Go: package main

import (
	"bufio"
	"os"
	"strconv"
	"strings"
		"reflect"
	"fmt"
)

var scanner = bufio.NewScanner(os.Stdin)

func main() {
	// 上面の色を固定してから、左右方向に回転して一致するものがあるかを調べる
	round := [][]int{
		{1,2,3,4,5,6}, {1,3,5,2,4,6}, {1,4,2,5,3,6}, {1,5,4,3,2,6}, // c1を上面に固定して回転
		{2,6,3,4,1,5}, {2,3,1,6,4,5}, {2,1,4,3,6,5}, {2,4,6,1,3,5}, // c2を上面に固定して回転
		{3,1,2,5,6,4}, {3,2,6,1,5,4}, {3,5,1,6,2,4}, {3,6,5,2,1,4}, // c3を上面に固定して回転
		{4,1,5,2,6,3}, {4,2,1,6,5,3}, {4,5,6,1,2,3}, {4,6,2,5,1,3}, // c4を上面に固定して回転
		{5,1,3,4,6,2}, {5,3,6,1,4,2}, {5,4,1,6,3,2}, {5,6,4,3,1,2}, // c5を上面に固定して回転
		{6,2,4,3,5,1}, {6,3,2,5,4,1}, {6,5,3,4,2,1}, {6,4,5,2,3,1}, // c6を上面に固定して回転

	}
	for scanner.Scan() {
		n, _ := strconv.Atoi(scanner.Text())
		if n == 0 {
			break
		}
		cubes := make([][]string, n)
		for i := 0; i < n; i++ {
			scanner.Scan()
			cubes[i] = strings.Split(scanner.Text(), " ")
		}
		check := func(a, b int) bool {
			tmp := make([]string, 6)
			for i := 0; i < 24; i++ {
				for j := 0; j < 6; j++ {
					tmp[j] = cubes[b][round[i][j]-1]
				}
				if reflect.DeepEqual(tmp, cubes[a]) {
					return true
				}
			}
			return false
		}
		tbl := make([]int, n)
		// 全ての組み合わせを調べる
		for i := 0; i < n; i++ {
			if tbl[i] == 1 {
				continue
			}
			for j := i+1; j < n; j++ {
				if check(i, j) {
					tbl[j] = 1
				}
			}
		}
		fmt.Println(sum(tbl))
	}
}

func sum(a []int) int {
	ret := 0
	for _, v := range a {
		ret += v
	}
	return ret
}

C++: #include <bits/stdc++.h>
using namespace std ;

#define pb(n) push_back(n)
#define fi first
#define se second
#define all(r) (r).begin(),(r).end()
#define vmax(ary) *max_element(all(ary))
#define vmin(ary) *min_element(all(ary))
#define debug(x) cout<<#x<<": "<<x<<endl
#define fcout(n) cout<<fixed<<setprecision((n))
#define scout(n) cout<<setw(n)
#define vary(type,name,size,init) vector< type> name(size,init)
#define vvl(v,w,h,init) vector<vector<ll>> v(w,vector<ll>(h,init))
#define mp(a,b) make_pair(a,b)

#define rep(i,n) for(int i = 0; i < (int)(n);++i)
#define REP(i,a,b) for(int i = (a);i < (int)(b);++i)
#define repi(it,array) for(auto it = array.begin(),end = array.end(); it != end;++it)
#define repa(n,array) for(auto &n :(array))

using ll = long long;
using vi = vector<int>;
using vl = vector<ll>;
using dict = map<string,int>;
using pii = pair<int,int> ;
using pll = pair<ll,ll> ;

const int mod = 1000000007;
constexpr int inf = ((1<<30)-1)*2+1 ;
constexpr double PI = acos(-1.0) ;
double eps = 1e-10 ;
const int dy[] = {-1,0,1,0,1,-1,1,-1};
const int dx[] = {0,-1,0,1,1,-1,-1,1};

inline bool value(int x,int y,int w,int h){
  return (x >= 0 && x < w && y >= 0 && y < h);
}

template<typename T>
void Unique(vector<T> &v){
  sort(all(v));
  v.erase(unique(all(v)),v.end());
}
template<typename T,typename U>
ll FindErase(T &v,U tar){
  ll cnt = 0;
  for(auto it = v.begin(); it != v.end();){
    if(*it == tar){
      it = v.erase(it);
      ++cnt;
    }
    else{
      ++it;
    }
  }
  return cnt;
}

enum{
  t = 0,f ,r ,b ,l ,d ,
};
class Dice{
  public:
    array<int,6> D;
    Dice(){
      D = {1,2,3,4,5,6};
    }
    Dice(array<int,6> d){
      D = d;
    }
    void Spin(int dir){
      if(dir == l){//
        swap(D[t],D[r]);
        swap(D[r],D[d]);
        swap(D[d],D[l]);
      }
      else if(dir == r){
        swap(D[t],D[l]);
        swap(D[l],D[d]);
        swap(D[d],D[r]);
      }
      else if(dir == f){
        swap(D[t],D[b]);
        swap(D[b],D[d]);
        swap(D[d],D[f]);
      }
      else if(dir == b){
        swap(D[t],D[f]);
        swap(D[f],D[d]);
        swap(D[d],D[b]);
      }
      else if(dir == d){//leftspin
        swap(D[f],D[r]);
        swap(D[r],D[b]);
        swap(D[b],D[l]);
      }
      else if(dir == t){
        swap(D[f],D[l]);
        swap(D[l],D[b]);
        swap(D[b],D[r]);
      }
    }
    void MatchDice(int T,int F){
      rep(i,4){
        Spin(r);
        if(D[t] == T)break;
      }
      if(D[t] != T){
        rep(i,4){
          Spin(f);
          if(D[t] == T)break;
        }
      }
      rep(i,4){
        Spin(t);
        if(D[f] == F) break;
      }
    }
    int& operator[](const int i){
      return D[i];
    }
    bool operator==(Dice& di2){
      rep(i,4){
        di2.Spin(r);
        rep(j,4){
          di2.Spin(t);
          rep(k,4){
            di2.Spin(r);
            if(D == di2.D){
              return true;
            }
          }
        }
      }
      return false;
    }
    friend ostream& operator<<(ostream& os,const Dice& di){
      os << "t f r l b d\n" ;
      rep(i,6){
        if(i) os << ' ';
        os << di.D[i] ;
      }
      return os;
    }
};

int main(){
  cin.tie(0);
  ios::sync_with_stdio(false);
  map<string,int> m;
  m["Cyan"] = 0,m["Yellow"] =1,m["Red"]=2,m["Magenta"] = 3, m["Green"] = 4, m["Blue"] = 5;
  ll n;
  while(cin >> n && n){
    vector<Dice> di(n);
    string s,s1,s2,s3,s4,s5;
    vector<Dice> st;
    rep(i,n){
      cin >> s >> s1 >> s2 >> s3 >> s4 >> s5;
      di[i][t] = m[s];
      di[i][f] = m[s];
      di[i][r] = m[s];
      di[i][l] = m[s];
      di[i][b] = m[s];
      di[i][d] = m[s];
      if(st.size() == 0){
        st.push_back(di[i]);
      }
      else{
        rep(j,st.size()){
          if(st[j] == di[i]){
            break;
          }
          if(j == st.size()-1){
            st.push_back(di[i]);
          }
        }
      }
    }
    cout << n - st.size()<<endl;
  }
  return 0;
}

C++: #include <iostream>
#include <complex>
#include <sstream>
#include <string>
#include <algorithm>
#include <deque>
#include <list>
#include <map>
#include <numeric>
#include <queue>
#include <vector>
#include <set>
#include <limits>
#include <cstdio>
#include <cctype>
#include <cmath>
#include <cstring>
#include <cstdlib>
#include <ctime>
using namespace std;
#define REP(i, j) for(int i = 0; i < (int)(j); ++i)
#define FOR(i, j, k) for(int i = (int)(j); i < (int)(k); ++i)
#define SORT(v) sort((v).begin(), (v).end())
#define REVERSE(v) reverse((v).begin(), (v).end())
typedef complex<double> P;
const int L = 6;

int H[6][6] = {
    {1,5,2,3,0,4}, // 0 : North : ?\\????§????   ( y:-1 )
    {3,1,0,5,4,2}, // 1 : East  : ???????§????   ( x:+1 )
    {2,1,5,0,4,3}, // 2 : West  : ???????§????   ( x:-1 )
    {4,0,2,3,5,1}, // 3 : South : ??????????§???? ( y:+1 )
    {0,2,4,1,3,5}, // 4 : Right : ?????????????????¢ (?§??????????)
    {0,3,1,4,2,5}  // 5 : Left  : ?????????????????¢ (?§??????????)
};
 
// d[0] := top,   d[1] := front 
// d[2] := right, d[3] := left
// d[4] := back,  d[5] := bottom
enum{TOP, FRONT, RIGHT, LEFT, BACK, BOTTOM};
struct Cube{
    vector<string> d;
    Cube(vector<string> v) { d = v; }
    Cube(){ d = vector<string>(6); }
    void roll(int dir){
        vector<string> nd(6);
        for(int i = 0 ; i < 6 ; i++ ) nd[i] = d[ H[dir][i] ];
        d = nd;
    }
};

bool preCompareCube(Cube &a, Cube b){
  if(a.d == b.d) return true;
  b.roll(4);
  if(a.d == b.d) return true;
  b.roll(4);
  if(a.d == b.d) return true;
  b.roll(4);
  if(a.d == b.d) return true;
  b.roll(4);
  return false;
}

bool compareCube(Cube &a, Cube b){
  if(preCompareCube(a, b)) return true;
  b.roll(0);
  if(preCompareCube(a, b)) return true;
  b.roll(0);
  if(preCompareCube(a, b)) return true;
  b.roll(0);
  if(preCompareCube(a, b)) return true;
  b.roll(0);

  b.roll(1);
  if(preCompareCube(a, b)) return true;
  b.roll(1);
  if(preCompareCube(a, b)) return true;
  b.roll(1);
  if(preCompareCube(a, b)) return true;
  return false;
}

int main() {
  int N;
  while(cin >>N && N){
    Cube c; REP(i, L) cin >>c.d[i];
    vector<Cube> res;
    res.push_back(c);
    FOR(n, 1, N){
      bool f = true;
      REP(i, L) cin >>c.d[i];
      REP(i, res.size()) if(compareCube(res[i], c)) f = false;
      if(f) res.push_back(c);
    }
    cout <<N - res.size() <<endl;
  }
  return 0;
}