@RIBA:
d20 = (20) = 20
d20 = (20) = 20d1488 = (503) = 503d20! = (10) = 10d777 = (198) = 198d2020 = (919) = 919d7777 = (3024) = 3024d10! = (3) = 3d3! = (2) = 2d2! = (1) = 11d777 = (551) = 551d4 = (2) = 2d1488 = (1150) = 1150d1488 = (209) = 209d2020 = (1578) = 15781d777 = (653) = 653d20! = (6) = 6d6! = (5) = 5d5! = (2) = 2d2! = (1) = 1d777 = (773) = 773d1488 = (376) = 376d2020 = (1303) = 1303d7777 = (926) = 926d20! = (13) = 13d13! = (6) = 6d6! = (1) = 1d1488 = (94) = 94