After the development of the large London Porter breweries in the 18th century, the trend grew for pubs to become tied houses which could only sell beer from one brewery (a pub not tied in this way was called a Free house). The usual arrangement for a tied house was that the pub was owned by the brewery but rented out to a private individual (landlord) who ran it as a separate business (even though contracted to buy the beer from the brewery). Another very common arrangement was (and is) for the landlord to own the premises (whether freehold or leasehold) independently of the brewer, but then to take a mortgage loan from a brewery, either to finance the purchase of the pub initially, or to refurbish it, and be required as a term of the loan to observe the solus tie.
If it is possible to answer this question, answer it for me (else, reply "unanswerable"): In what century did the habit arise of pubs selling beer from only one brewery?
Ah, so.. 18th

The Diwan of Umar, assigning annuities to all Arabs and to the Muslim soldiers of other races, underwent a change in the hands of the Umayyads. The Umayyads meddled with the register and the recipients regarded pensions as the subsistence allowance even without being in active service. Hisham reformed it and paid only to those who participated in battle. On the pattern of the Byzantine system the Umayyads reformed their army organization in general and divided it into five corps: the centre, two wings, vanguards and rearguards, following the same formation while on march or on a battle field. Marwan II (740–50) abandoned the old division and introduced Kurdus (cohort), a small compact body. The Umayyad troops were divided into three divisions: infantry, cavalry and artillery. Arab troops were dressed and armed in Greek fashion. The Umayyad cavalry used plain and round saddles. The artillery used arradah (ballista), manjaniq (the mangonel) and dabbabah or kabsh (the battering ram). The heavy engines, siege machines and baggage were carried on camels behind the army.
If it is possible to answer this question, answer it for me (else, reply "unanswerable"): Who didn't change the Diwan of Umar?
Ah, so.. unanswerable

CNET awarded PS3 Slim four out of five stars praising its Blu-ray capabilities, 120 GB hard drive, free online gaming service and more affordable pricing point, but complained about the lack of backward compatibility for PlayStation 2 games. TechRadar gave PS3 Slim four and a half stars out of five praising its new smaller size and summed up its review stating "Over all, the PS3 Slim is a phenomenal piece of kit. It's amazing that something so small can do so much". However, they criticized the exterior design and the build quality in relation to the original model.
If it is possible to answer this question, answer it for me (else, reply "unanswerable"): How many of its own five stars did TechRadar award the PS2 Slim?
Ah, so..
unanswerable