4. Amendment of section 20 of the principal enactment

Section 20 of the principal enactment is hereby amended in paragraph (b) of subsection (6) of that section by the substitution for words and figures "under paragraphs (a) or (c) of subsection (2) of section 2," of the words and figures "under paragraphs (a), (c), (d) or (e) of subsection (2)

of section 2,".