1. 2 on class
2. 1 in definition
3. 2 in notes

On grammatical class:

ni'o

discursive: paragraph break; introduce new topic.

no'i

discursive: paragraph break; resume previous topic.

In definition:

cmavrni'o

x₁ is the selma'o "NIhO".

In notes:

mei zei ni'orsu

x₁ is a part of Lojban text representing rule 'paragraphs' according to the first edition of the book 'The Complete Lojban Language'.

pa zei jarnezi

x₁ is a part of Lojban text representing rule 'text-1' according to the first edition of the book 'The Complete Lojban Language'.