Panchakshara with or without OM?

[yajvan]

hariḥ oṁ
~~~~~~
namasté

Consider looking to the results of using pañcamī (5^th) or ṣaṣthī (6^th) akṣarā ; does it bring about turīya ( the 4^th) ?

इतिशिवं
iti śivaṁ

1. akṣarā - imperishable ; a sound; another name of śiva; here it is used as a syllable.