code: func matchWithoutOrder(a1, a2 []string) bool {
  	if len(a1) != len(a2) {
  		return false
  	}
  
  	m := make(map[string]bool)
  
  	for _, x := range a1 {
  		m[x] = true
  	}
  
  	for _, y := range a2 {
  		if _, ok := m[y]; !ok {
  			return false
  		}
  	}
  
  	return true
  }
docs: // helper func to check whether two lists of (distinct) strings matches without order