Proposal to revise the definition of principal grooves in paragraph 2.14.1.; delete paragraph 2.48. and renumber subsequent paragraphs; amend paragraph 2.51. regarding material supplier definition; revise paragraph 3.2.6. on M+S inscription requirements; modify paragraph 4.1.5.3.2. to include a table of tyres classified for severe snow conditions; delete paragraphs 4.1.5.3.2.1., 4.1.5.3.2.2., and 4.1.5.3.2.3.; revise paragraphs 6.5.3., 6.5.8., 6.6., 6.7.4., and 7.1.5. regarding material supplier requirements and diameter calculations.