#include<bits/stdc++.h>
using namespace std;
int flag;
int main(){
	
	int n;
	string a,b,c;
	cin>>n;
	for(int k=1;k<=n;k++){
		cin>>a>>b>>c;
		cout<<"Case "<<k<<": ";
		for(int i=0,j=0,l=0;l<c.size();l++){
			if(b[j]==c[l]&&a[i]==c[l]){
				if(a.size()-i<b.size()-j){
					j++;
				}else{
					i++;
				}
			}
			else if(a[i]==c[l]&&b[j]!=c[l]){
				i++;
			}else if(b[j]==c[l]&&a[i]!=c[l]){
				j++;
			}else{
				flag=1;
				cout<<"no"<<endl;
				break;
			}
		}if(flag==0){
			cout<<"yes"<<endl;
		}
	}
	return 0;
} 

#include<bits/stdc++.h> using namespace std; int main() { int n; string s1,s2,s3; bool flag=false; cin>>n; for(int i=1;i<=n;i++) { cin>>s1>>s2>>s3; for(int j=0,k=0,a=0;a<s3.size();a++) { if(s2[k]==s3[a]&&s1[j]==s3[a]) { if(s1.size()-j<s2.size()-k) { k++; } else { j++; } } else if(s1[j]==s3[a]&&s2[k]!=s3[a]) { j++; } else if(s2[k]s3[a]&&s1[j]!=s3[a]) { k++; } else { flag=true; cout<<"Case "<<i<<": "<<"no"<<endl; break; } } if(flagfalse) { cout<<"Case "<<i<<": "<<"yes"<<endl; } } }