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sing the other half of the line with the first half of the second line. In order to sing the remaining half line, they repeat the first half of the line. The first part of that line thus happens to be recited twice.
This is very inappropriate. If one wants to repeat a line, it should be the first obeisance, which is the most significant line and is separately uttered on many occasions. Some people do recite it as such. But splitting a part of one sentence and joining it with a line of obeisance and reciting the other part of the sentence with a part of another sentence results in wantonly tempering with the sanctity of the composition. The combining of the 7th and 8th results in singing it as 'Savva Pävappanosano Mangalanam Cha Savvesim. That means: "The destroyers of all sins among all blissful aspects'. Does that make any sense? Does it not amount to mutilation of the sacred Mantra?
People indulge in such mutilation, because they do not know the meaning of what they are uttering. That needs to be scrupulously avoided. Simply because others do it, is not the justification for such indulgence. The right way of reciting this Mantra is to utter the first five lines separately with or without Aum and then to sing the verse composed of the remaining two lines.