public class Diamond
{
public static void main(String[] args)
{
int num=12;
int d=12;
int e=0;
for (int a = 0; a <= num; a++)
{
for (int c = d; c>= 1; c-- )
System.out.print(" ");
d-=1;
for (int b = 1; b <= a; b++)
System.out.print ("a ");
System.out.println();
}
num-=1;
for (int a = 0; a<=num; a++)
{
for (int b = num; b > a; b--)
System.out.print (" a");
System.out.println();
for (int c = 0; c <= e; c++)
System.out.print(" ");
e+=1;
}
}
}
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