The monotony is optional in the recitation of the Vedas or they may be recited with accents.,
In the Chhandas or the Vedas there is option either to use the Ekasruti tone or the three tones. Even on the occasion of ordinary reading, the Chhandas might be uttered either with the three accents or monotonously. Some say this is a limited option (vyavasthita-vibhasha).
The option allowed by this sutra is to be adjusted in this way. In reading the Mantra portion of the Veda, every word must be pronounced with its proper accent: but in the Brahmana portion of the Veda there might be Ekasruti; while some say there must be Ekasruti necessarily and not optionally in the recitation of the Brahmanas.
Thus:- अ॒॒ग्निमी॑ले पु॒॒रोहि॑तं or simply अग्निमीले पुरोहितं. \I praise Agni the purohita.\
The word वा \optionally\ of the last sutra could easily have been read into this sutra by the rule of anuvritti; why then use the word विभाषा \optional\ again ? To this we reply, this apparently redundant repetition is for the sake of indicating that the anuvritti of the word यज्ञकर्मणि, which was understood in the last sutra, does not extend to this. Had we taken the anuvritti of वा, the other word also would have been attracted; hence the separate use of the word विभाषा.,