6. Al-Mujtass, twice
Mustaf’i.lun Fá.’ilátun Mustaf’i.lun (ii. [10]. 7. 10)
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E. Dáirat al-Muttafik, circle of “the concordant” metre, so called for the same reason why circle B is called “the agreeing,” i.e. because the feet all harmonise in length, being here, however quinqueliteral, not seven-lettered as in the Mútalif. Al-Khalíl, the inventor of the ’Ilm al-’Arúz, assigns to it only one metre:
1. Al-Mutakárib, twice
Fa’úlun Fa’úlun Fa’úlun Fa’úlun (ii. [1])
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Later Prosodists added:
2. Al-Mutadárak, twice
Fá’ilun Fá’ilun Fá’ilun Fá’ilun (ii. [5])