#include<stdio.h>
#include<stdlib.h>
int main()
{
 int source[26],dest[26],same[26],i,j,no_of_tests,no_of_words,count,count1,count2;
 char str[5],start,end;
 scanf("%d",&no_of_tests);
 for(i=1;i<=no_of_tests;i++)
 {
	 count=0;
	 count1=0;
	 count2=0;
	 scanf("%d",&no_of_words);
	 fread(str,1,1,stdin);   // done 2 eat up the line feed
	 for(j=0;j<26;j++)
	 {
		source[j]=0;
		dest[j]=0;
		same[j]=0;
	 }
	 for(j=1;j<=no_of_words;j++)
	 {
		fread(str,1,1,stdin);
		start=str[0];
		while(str[0]>='a'&& str[0]<='z')
		{
		  end=str[0];
		  fread(str,1,1,stdin);
		}
		if(start==end)
		 same[start-'a']=1;
		else
		{
		  source[start-'a']++;
		  dest[end-'a']++;
		}
	 }
	 for(j=0;j<26;j++)
	 {
		if(same[j])
		{
			if(source[j])
			{
			  same[j]--;
			  source[j]--;
			}
			else if(dest[j])
			{
			  dest[j]--;
			  same[j]--;
			}
		}
		if(source[j]>dest[j])
		{
		  source[j]-=dest[j];
		  dest[j]=0;
		}
		else
		{
		  dest[j]-=source[j];
		  source[j]=0;
		}
	 }
	 for(j=0;j<26;j++)
	 {
		 if(same[j])
			 count++;
	 }
	 if(count>1)
	 {
		 printf("The door cannot be opened.\n");
		 continue;
	 }
	 if(count)
	 {
		for(j=0;j<26;j++)
		{
			if(source[j]!=0||dest[j]!=0)
			  break;
		}
		if(j==26)
		{
			printf("Ordering is possible.\n");
			continue;
		}
		printf("The door cannot be opened.\n");                      ////
		continue;
	 }
	 for(j=0;j<26;j++)
	 {
		  count1+=source[j];
		  count2+=dest[j];
	 }
	 if((count1==1&&count2==1)||(count1==0&&count2==0))
	 {
			printf("Ordering is possible.\n");
			continue;
	 }
	 printf("The door cannot be opened.\n");
 }
 return 0;
}