public boolean loneTeen(int a, int b) {

  if((a>=13 && a<=19) && (b>=13 && b<=19)); {
    return false;
  }
  return (a>=13 && a<=19) 
}
public boolean loneTeen(int a, int b) {
  // Store teen-ness in boolean local vars first. Boolean local
  // vars like this are a little rare, but here they work great.
  boolean aTeen = (a >= 13 && a <= 19);
  boolean bTeen = (b >= 13 && b <= 19);
  
  return (aTeen && !bTeen) || (!aTeen && bTeen);
  // Translation: one or the other, but not both.
  // Alternately could use the Java xor operator, but it's obscure.
}
add loneTeen solution from site that has genius boolean shortcuts