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butterfly-pattern.java
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import java.util.*;
public class patterns {
public static void main(String argc[]) {
int b = 1;
Scanner sc = new Scanner(System.in);
int a = sc.nextInt();
for (int i = 1; i<=a; i++) {
for (int j2 = 0; j2 < i; j2++) {
System.out.print(" *");
}
for (int j3 = 0; j3 < 2*a-2*i; j3++) {
System.out.print(" ");
}
for (int j4 = 0; j4 < i; j4++) {
System.out.print(" *");
}
System.out.println("");
}
for (int i = 0; i <a; i++) {
for (int j2 = 0; j2 < a-i; j2++) {
System.out.print(" *");
}
for (int j3 = 0; j3 <2*i; j3++) {
System.out.print(" ");
}
for (int j4 = 0; j4 < a-i; j4++) {
System.out.print(" *");
}
System.out.println("");
}
}
}