«كُلٌّ فِي فَلَكٍ» — reversal preserves the letter sequence, so the relevant device is qalb.
«يا خاطب الدنيا الدنية ... الردى ... الأكدار» — a poetic line admits two valid stopping points; this is tashrīʿ.
«فَلَا تَقْهَرْ ... فَلَا تَنْهَرْ» — the endings agree not only in the final consonant but also in a preceding consonant, illustrating the extra-commitment aspect of luzūm mā lā yalzam.
These devices are classified not by subject matter but by the location and condition of the verbal pattern.