15, 16. (a) Why might it be a challenge to keep the Kingdom Hall clean, but why is it necessary?
(‏ ب )‏ مَا تَرْتِيبَاتُ ٱلتَّنْظِيفِ ٱلْمُتَّبَعَةُ فِي جَمَاعَتِكَ ،‏ وَأَيُّ ٱمْتِيَازٍ نَمْتَلِكُهُ جَمِيعًا ؟‏