31. Schedule 7 to the Principal Act is amended—
(a) by omitting from the third column of item 9 of Part I “ workmen ” and substituting “ workers ”;
(b) by omitting from the second column of item 18 of Part II “ (1A) ” and substituting “ (1B) ”; and
(c) by omitting from the second column of item 20 of Part II “ (4) ” and substituting “ (5) ”.