كُلٌّ فِي فَلَكٍ
Each moves in an orbit.
Ignoring incidental vowel marks and spaces, the underlying letter sequence has a reversal property associated with qalb mustawī. Tashrīʿ structures a poetic line so that two potential rhyme endings can each yield a meaningful closure.
Luzūm mā lā yalzam voluntarily maintains a sound correspondence before the required rhyme consonant or prose ending, beyond the minimal formal requirement. These are three distinct mechanisms despite all involving skillful verbal design.