In addition to the deduction referred to in Article 168, the taxable person shall be entitled to deduct the VAT referred to therein in so far as the goods and services are used for the purposes of the following:

(a) 

transactions other than those exempt under Article 284 relating to the activities referred to in the second subparagraph of Article 9(1), carried out outside the Member State in which that tax is due or paid, in respect of which VAT would be deductible if they had been carried out within that Member State;

(b) 

transactions which are exempt pursuant to Articles 136a, 138, 142 or 144, Articles 146 to 149, Articles 151, 152, 153 or 156, Article 157(1)(b), Articles 158 to 161 or Article 164;

(c) 

transactions which are exempt pursuant to points (a) to (f) of Article 135(1), where the customer is established outside the Community or where those transactions relate directly to goods to be exported out of the Community.