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ॐ सूक्ष्मं तु तदर्हत्वात् ॐ ॥ १.४.२॥

Rather the subtle (causal state) is meant (by avyakta), for it deserves that epithet.

english translation

OM sUkSmaM tu tadarhatvAt OM || 1.4.2||

hk transliteration by Sanscript