#r1

What does "r1" mean?
riz_11, rumena_101, rafe_1990, Romans1_16, Romans13_14, royals_1902, relaxed_1, rifard_1, reeses_10sale, ramad__10, rienda_10th, rienda_10thanniversary, rusmobphoto_134, rah_15m, rxking_135, raine_1810, rusmobphoto_136, RK_1002wd, rgo_1845, reborn_16, Round_1, rcd_16, recenzije_121, rei_1440project, rx_100, ranie_1713, rmzyat_16, rozus_19, rusmobphoto_137, rfrahimiyan_16

r1-5 14177 r1-8 6301 r1-0 2708 r1-m 2673 r1-7 1958 r1-6 1531 r1-9 1342 r1-3 1331 r1-1 1005 r1-2 781 r1-200gs 5122 r1-3shop 4126 r1-hackney 3690 r1-concepts 3121 r1-instawin 2796 r1-5indonesia 2742 r1-25 2494 r1-00 1815 r1-29 889 r1-4 391 r1-s 248 r1-0torio 2385 r1-200gsa 1553 r1-07 689 r1-54 633 r1-mostwanted 1478 r1-0v 582 r1-bikes 849 r1-70 470 r1-r6 344 r1-suprasunday 1233 r1-5er 505 r1-000 421 r1-71 326 r1-s1 321 r1-34 311 r1-m3 275 r1-4feb 652 r1-01 254 r1-ode 355 r1-rocks 590 r1-200rt 453 r1-thrashed 624 r1-200r 505 r1-200gsadv 562 r1-72 204 r1-150gs 387 r1-200 307 r1-1turbo 470 r1-8society 445 r1-1dedits 375 r1-200gsadventure 432 r1-6usa 330 r1-swag 307