كُلٌّ فِي فَلَكٍ
Each moves in an orbit.
Ignoring vowel signs and ordinary word spacing, the relevant consonantal sequence exhibits the notable reverse symmetry known as qalb mustawī. The test concerns the complete sequence of letters in the selected span, not simply resemblance between two separate words.
وَرَبَّكَ فَكَبِّرْ
And magnify your Lord.
In this second example, the discussion concerns the core expression “rabbaka fa-kabbir” apart from the prefixed coordinating wāw. One should neither include the conjunction without analysis and reject the illustration nor assume that every case must be assessed over the same arbitrary span.