_getHomePetExpression() {
    const cats = new ExpressionTerminal('Cats')
    const dogs = new ExpressionTerminal('Dogs')
    return new ExpressionOr(cats, dogs)
  }
// Rule: Cats and Dogs are home pets
Cats and Dogs are home pets
Cats and Dogs are home pets
_getHomePetExpression() {
    const cats = new ExpressionTerminal('Cats')
    const dogs = new ExpressionTerminal('Dogs')
    return new ExpressionOr(cats, dogs)
  }
_getHomePetExpression ( ) { const cats = new ExpressionTerminal ( 'Cats' ) const dogs = new ExpressionTerminal ( 'Dogs' ) return new ExpressionOr ( cats , dogs ) }
Rule: Cats and Dogs are home pets
Rule : Cats and Dogs are home pets