Comments

Comm. NT: 30.
Catudhātuvavatthānabhāvanāvaṇṇanā

‘From resolution of these eight’: the eight dhammas beginning with colour when resolved by means of understanding, are apprehendable (upalabbhanti) in the ultimate sense through mutual negation (aññam-añña-vyatirekena); but head hairs are not apprehendable in the ultimate sense through negation of colour and so on.
Consequently, the term of common usage ‘head hairs’ is applied to these dhammas in their co-arisen state; but if they are each taken separately, ‘There is no common-usage head hairs.’ The meaning is that it is a mere conventional term.
‘Only a mere group of eight states’ is said, taking the colour, etc., which are real (bhūta—lit. ‘become’), as a unity by means of the concept (paññatti) ‘a head hair,’ not only because they are merely the eight states.

пали	Tesaṃyeva vinibbhogā, natthi kesāti sammuti.
Nyanamoli thera	And separately from these eight30 There is no common usage head hairs.