C :

#include <stdio.h>
#include <math.h>
int main() {
        char A, B, C;
        for (A = 'X';A <= 'Z';A++) {
                if (A == 'X')
                        continue;
                for (B = 'X';B <= 'Z';B++) {
                        if (B == A)
                                continue;
                        for (C = 'X';C <= 'Z';C++) {
                                if (C == A || C == B || C == 'X' || C == 'Z')
                                        continue;
                                printf("A %c\n", A);
                                printf("B %c\n", B);
                                printf("C %c\n", C);
                        }
                }
        }
        return 0;
}

C++ :

#include <stdio.h>
#include <math.h>
int main() {
	char A, B, C;
	for (A = 'X';A <= 'Z';A++) {
		if (A == 'X')
			continue;
		for (B = 'X';B <= 'Z';B++) {
			if (B == A)
				continue;
			for (C = 'X';C <= 'Z';C++) {
				if (C == A || C == B || C == 'X' || C == 'Z')
					continue;
				printf("A %c\n", A);
				printf("B %c\n", B);
				printf("C %c\n", C);
			}
		}
	}
	return 0;
}

Pascal :

begin
  writeln('A Z');
  writeln('B X');
  writeln('C Y');
  end.

Java :

public class Main {

	public static void main(String[] args) {
		char i, j, k;
		for (i = 'X'; i <= 'Z'; i++) {
			for (j = 'X'; j <= 'Z'; j++) {
				if (i != j) {
					for (k = 'X'; k <= 'Z'; k++) {
						if( k!=i && k!= j ){
							if( i!='X' && k!='X' && k!='Z' )
							{
								System.out.printf("A %c\nB %c\nC %c\n",i,j,k);
							}
						}

					}
				}
			}
		}

	}
}

Python :

print "A Z\nB X\nC Y"