public String getAppliedExpression(String baseExpression) {
      return switch (instantApplied) {
        case 0 -> baseExpression;
        case 1 -> "*" + baseExpression;
        case 2 -> baseExpression + "*";
        case 3 -> "*" + baseExpression + "*";
        default -> baseExpression;
      };
    }
public String getAppliedExpression(String baseExpression)