YES(?,O(n^1)) 1125.86/297.10 YES(?,O(n^1)) 1125.86/297.10 1125.86/297.10 We are left with following problem, upon which TcT provides the 1125.86/297.10 certificate YES(?,O(n^1)). 1125.86/297.10 1125.86/297.10 Strict Trs: 1125.86/297.10 { 2(2(x1)) -> 5(1(1(0(1(3(2(1(1(2(x1)))))))))) 1125.86/297.10 , 2(2(2(x1))) -> 5(3(0(1(3(4(3(2(0(5(x1)))))))))) 1125.86/297.10 , 2(2(2(2(x1)))) -> 4(1(2(0(4(4(4(3(5(5(x1)))))))))) 1125.86/297.10 , 2(2(2(5(0(0(x1)))))) -> 5(5(1(2(3(3(5(0(4(3(x1)))))))))) 1125.86/297.10 , 2(2(2(3(4(1(x1)))))) -> 0(3(1(3(5(0(4(2(0(3(x1)))))))))) 1125.86/297.10 , 2(2(5(4(5(4(4(x1))))))) -> 5(5(4(0(1(4(5(0(4(0(x1)))))))))) 1125.86/297.10 , 2(2(4(x1))) -> 5(1(0(1(3(5(5(0(4(1(x1)))))))))) 1125.86/297.10 , 2(2(4(5(x1)))) -> 4(3(3(0(4(0(2(5(1(2(x1)))))))))) 1125.86/297.10 , 2(2(4(5(4(x1))))) -> 5(0(2(4(0(1(3(5(3(4(x1)))))))))) 1125.86/297.10 , 2(2(4(4(x1)))) -> 2(0(0(1(3(2(1(4(2(4(x1)))))))))) 1125.86/297.10 , 2(0(2(2(3(x1))))) -> 4(0(1(5(5(0(2(1(2(1(x1)))))))))) 1125.86/297.10 , 2(4(2(2(2(x1))))) -> 0(4(2(1(1(0(1(1(5(5(x1)))))))))) 1125.86/297.10 , 2(4(2(2(2(1(4(x1))))))) -> 3(4(4(1(3(1(5(3(2(2(x1)))))))))) 1125.86/297.10 , 5(2(5(2(4(x1))))) -> 2(5(5(1(1(3(5(0(3(1(x1)))))))))) 1125.86/297.10 , 5(2(4(1(2(2(x1)))))) -> 3(5(4(0(5(3(3(3(1(1(x1)))))))))) 1125.86/297.10 , 5(5(4(4(2(x1))))) -> 5(5(0(3(2(0(1(4(1(2(x1)))))))))) 1125.86/297.10 , 5(1(0(2(2(2(0(x1))))))) -> 1(5(4(5(4(4(3(2(1(3(x1)))))))))) 1125.86/297.10 , 5(1(0(3(2(2(x1)))))) -> 4(1(0(5(4(3(1(2(0(5(x1)))))))))) 1125.86/297.10 , 5(3(2(2(4(1(x1)))))) -> 1(2(1(1(5(5(3(3(4(1(x1)))))))))) 1125.86/297.10 , 5(4(5(2(2(2(3(x1))))))) -> 0(1(2(0(0(2(1(2(2(3(x1)))))))))) 1125.86/297.10 , 5(4(0(0(2(2(3(x1))))))) -> 4(3(3(0(3(4(0(0(2(1(x1)))))))))) 1125.86/297.10 , 1(4(4(2(4(4(x1)))))) -> 4(1(0(1(5(4(3(4(1(4(x1)))))))))) 1125.86/297.10 , 0(0(5(4(5(3(4(x1))))))) -> 5(5(1(5(5(2(2(0(0(4(x1)))))))))) 1125.86/297.10 , 3(2(2(4(5(4(x1)))))) -> 3(3(2(0(5(5(3(5(4(1(x1)))))))))) 1125.86/297.10 , 3(5(1(4(5(2(x1)))))) -> 2(1(4(0(4(2(5(1(2(5(x1)))))))))) 1125.86/297.10 , 4(2(2(5(3(x1))))) -> 3(3(4(0(5(5(5(0(0(1(x1)))))))))) 1125.86/297.10 , 4(2(3(2(5(x1))))) -> 1(4(3(0(4(0(3(5(1(2(x1)))))))))) 1125.86/297.10 , 4(5(2(x1))) -> 1(1(0(2(1(0(3(0(1(2(x1)))))))))) 1125.86/297.10 , 4(5(2(x1))) -> 0(3(0(1(4(1(3(5(0(5(x1)))))))))) 1125.86/297.10 , 4(5(2(x1))) -> 3(0(2(1(0(4(3(1(3(2(x1)))))))))) } 1125.86/297.10 Obligation: 1125.86/297.10 derivational complexity 1125.86/297.10 Answer: 1125.86/297.10 YES(?,O(n^1)) 1125.86/297.10 1125.86/297.10 The problem is match-bounded by 2. The enriched problem is 1125.86/297.10 compatible with the following automaton. 1125.86/297.10 { 2_0(1) -> 1 1125.86/297.10 , 2_1(1) -> 10 1125.86/297.10 , 2_1(2) -> 10 1125.86/297.10 , 2_1(8) -> 7 1125.86/297.10 , 2_1(10) -> 99 1125.86/297.10 , 2_1(17) -> 16 1125.86/297.10 , 2_1(18) -> 178 1125.86/297.10 , 2_1(19) -> 10 1125.86/297.10 , 2_1(21) -> 20 1125.86/297.10 , 2_1(29) -> 28 1125.86/297.10 , 2_1(34) -> 152 1125.86/297.10 , 2_1(42) -> 41 1125.86/297.10 , 2_1(56) -> 85 1125.86/297.10 , 2_1(62) -> 61 1125.86/297.10 , 2_1(64) -> 63 1125.86/297.10 , 2_1(70) -> 78 1125.86/297.10 , 2_1(71) -> 1 1125.86/297.10 , 2_1(71) -> 10 1125.86/297.10 , 2_1(71) -> 18 1125.86/297.10 , 2_1(71) -> 34 1125.86/297.10 , 2_1(71) -> 99 1125.86/297.10 , 2_1(71) -> 216 1125.86/297.10 , 2_1(76) -> 75 1125.86/297.10 , 2_1(84) -> 83 1125.86/297.10 , 2_1(87) -> 86 1125.86/297.10 , 2_1(100) -> 10 1125.86/297.10 , 2_1(116) -> 115 1125.86/297.10 , 2_1(126) -> 125 1125.86/297.10 , 2_1(131) -> 119 1125.86/297.10 , 2_1(147) -> 146 1125.86/297.10 , 2_1(150) -> 149 1125.86/297.10 , 2_1(152) -> 151 1125.86/297.10 , 2_1(163) -> 162 1125.86/297.10 , 2_1(164) -> 163 1125.86/297.10 , 2_1(167) -> 166 1125.86/297.10 , 2_1(173) -> 10 1125.86/297.10 , 2_1(176) -> 175 1125.86/297.10 , 2_1(185) -> 10 1125.86/297.10 , 2_1(192) -> 191 1125.86/297.10 , 2_1(202) -> 201 1125.86/297.10 , 2_2(1) -> 216 1125.86/297.10 , 2_2(2) -> 216 1125.86/297.10 , 2_2(19) -> 216 1125.86/297.10 , 2_2(34) -> 225 1125.86/297.10 , 2_2(71) -> 234 1125.86/297.10 , 2_2(100) -> 216 1125.86/297.10 , 2_2(138) -> 137 1125.86/297.10 , 2_2(164) -> 243 1125.86/297.10 , 2_2(173) -> 216 1125.86/297.10 , 2_2(185) -> 216 1125.86/297.10 , 2_2(214) -> 213 1125.86/297.10 , 2_2(223) -> 222 1125.86/297.10 , 2_2(232) -> 231 1125.86/297.10 , 2_2(241) -> 240 1125.86/297.10 , 2_2(254) -> 253 1125.86/297.10 , 5_0(1) -> 1 1125.86/297.10 , 5_1(1) -> 18 1125.86/297.10 , 5_1(2) -> 1 1125.86/297.10 , 5_1(2) -> 10 1125.86/297.10 , 5_1(2) -> 18 1125.86/297.10 , 5_1(2) -> 26 1125.86/297.10 , 5_1(2) -> 49 1125.86/297.10 , 5_1(2) -> 99 1125.86/297.10 , 5_1(2) -> 164 1125.86/297.10 , 5_1(2) -> 216 1125.86/297.10 , 5_1(9) -> 62 1125.86/297.10 , 5_1(17) -> 200 1125.86/297.10 , 5_1(18) -> 26 1125.86/297.10 , 5_1(27) -> 2 1125.86/297.10 , 5_1(32) -> 31 1125.86/297.10 , 5_1(34) -> 68 1125.86/297.10 , 5_1(39) -> 38 1125.86/297.10 , 5_1(47) -> 46 1125.86/297.10 , 5_1(53) -> 52 1125.86/297.10 , 5_1(54) -> 53 1125.86/297.10 , 5_1(55) -> 171 1125.86/297.10 , 5_1(69) -> 68 1125.86/297.10 , 5_1(71) -> 18 1125.86/297.10 , 5_1(81) -> 80 1125.86/297.10 , 5_1(82) -> 81 1125.86/297.10 , 5_1(98) -> 97 1125.86/297.10 , 5_1(100) -> 71 1125.86/297.10 , 5_1(101) -> 100 1125.86/297.10 , 5_1(105) -> 104 1125.86/297.10 , 5_1(107) -> 92 1125.86/297.10 , 5_1(110) -> 109 1125.86/297.10 , 5_1(120) -> 119 1125.86/297.10 , 5_1(122) -> 121 1125.86/297.10 , 5_1(128) -> 127 1125.86/297.10 , 5_1(134) -> 133 1125.86/297.10 , 5_1(135) -> 134 1125.86/297.10 , 5_1(157) -> 156 1125.86/297.10 , 5_1(161) -> 28 1125.86/297.10 , 5_1(162) -> 161 1125.86/297.10 , 5_1(169) -> 168 1125.86/297.10 , 5_1(170) -> 169 1125.86/297.10 , 5_1(177) -> 176 1125.86/297.10 , 5_1(181) -> 180 1125.86/297.10 , 5_1(182) -> 181 1125.86/297.10 , 5_1(183) -> 182 1125.86/297.10 , 5_2(71) -> 255 1125.86/297.10 , 5_2(141) -> 140 1125.86/297.10 , 5_2(142) -> 141 1125.86/297.10 , 5_2(208) -> 99 1125.86/297.10 , 5_2(208) -> 151 1125.86/297.10 , 5_2(217) -> 151 1125.86/297.10 , 5_2(226) -> 10 1125.86/297.10 , 5_2(226) -> 99 1125.86/297.10 , 5_2(226) -> 152 1125.86/297.10 , 5_2(226) -> 178 1125.86/297.10 , 5_2(226) -> 216 1125.86/297.10 , 5_2(226) -> 225 1125.86/297.10 , 5_2(235) -> 162 1125.86/297.10 , 5_2(265) -> 264 1125.86/297.10 , 5_2(266) -> 265 1125.86/297.10 , 1_0(1) -> 1 1125.86/297.10 , 1_1(1) -> 56 1125.86/297.10 , 1_1(3) -> 2 1125.86/297.10 , 1_1(4) -> 3 1125.86/297.10 , 1_1(6) -> 5 1125.86/297.10 , 1_1(9) -> 8 1125.86/297.10 , 1_1(10) -> 9 1125.86/297.10 , 1_1(11) -> 56 1125.86/297.10 , 1_1(13) -> 12 1125.86/297.10 , 1_1(16) -> 130 1125.86/297.10 , 1_1(19) -> 56 1125.86/297.10 , 1_1(20) -> 19 1125.86/297.10 , 1_1(26) -> 91 1125.86/297.10 , 1_1(28) -> 27 1125.86/297.10 , 1_1(34) -> 126 1125.86/297.10 , 1_1(37) -> 36 1125.86/297.10 , 1_1(45) -> 44 1125.86/297.10 , 1_1(51) -> 50 1125.86/297.10 , 1_1(56) -> 113 1125.86/297.10 , 1_1(67) -> 66 1125.86/297.10 , 1_1(70) -> 160 1125.86/297.10 , 1_1(71) -> 56 1125.86/297.10 , 1_1(74) -> 73 1125.86/297.10 , 1_1(77) -> 76 1125.86/297.10 , 1_1(80) -> 79 1125.86/297.10 , 1_1(85) -> 84 1125.86/297.10 , 1_1(88) -> 87 1125.86/297.10 , 1_1(89) -> 88 1125.86/297.10 , 1_1(91) -> 90 1125.86/297.10 , 1_1(92) -> 56 1125.86/297.10 , 1_1(95) -> 94 1125.86/297.10 , 1_1(97) -> 96 1125.86/297.10 , 1_1(99) -> 150 1125.86/297.10 , 1_1(102) -> 101 1125.86/297.10 , 1_1(103) -> 102 1125.86/297.10 , 1_1(118) -> 117 1125.86/297.10 , 1_1(119) -> 1 1125.86/297.10 , 1_1(119) -> 18 1125.86/297.10 , 1_1(119) -> 68 1125.86/297.10 , 1_1(119) -> 70 1125.86/297.10 , 1_1(119) -> 77 1125.86/297.10 , 1_1(119) -> 97 1125.86/297.10 , 1_1(132) -> 131 1125.86/297.10 , 1_1(133) -> 132 1125.86/297.10 , 1_1(146) -> 35 1125.86/297.10 , 1_1(151) -> 150 1125.86/297.10 , 1_1(156) -> 127 1125.86/297.10 , 1_1(172) -> 71 1125.86/297.10 , 1_1(178) -> 177 1125.86/297.10 , 1_1(190) -> 119 1125.86/297.10 , 1_1(193) -> 192 1125.86/297.10 , 1_1(197) -> 196 1125.86/297.10 , 1_1(199) -> 198 1125.86/297.10 , 1_1(203) -> 202 1125.86/297.10 , 1_1(207) -> 206 1125.86/297.10 , 1_2(19) -> 272 1125.86/297.10 , 1_2(20) -> 145 1125.86/297.10 , 1_2(137) -> 97 1125.86/297.10 , 1_2(139) -> 138 1125.86/297.10 , 1_2(140) -> 139 1125.86/297.10 , 1_2(209) -> 208 1125.86/297.10 , 1_2(210) -> 209 1125.86/297.10 , 1_2(212) -> 211 1125.86/297.10 , 1_2(215) -> 214 1125.86/297.10 , 1_2(216) -> 215 1125.86/297.10 , 1_2(218) -> 217 1125.86/297.10 , 1_2(219) -> 218 1125.86/297.10 , 1_2(221) -> 220 1125.86/297.10 , 1_2(224) -> 223 1125.86/297.10 , 1_2(225) -> 224 1125.86/297.10 , 1_2(227) -> 226 1125.86/297.10 , 1_2(228) -> 227 1125.86/297.10 , 1_2(230) -> 229 1125.86/297.10 , 1_2(233) -> 232 1125.86/297.10 , 1_2(234) -> 233 1125.86/297.10 , 1_2(236) -> 235 1125.86/297.10 , 1_2(237) -> 236 1125.86/297.10 , 1_2(239) -> 238 1125.86/297.10 , 1_2(242) -> 241 1125.86/297.10 , 1_2(243) -> 242 1125.86/297.10 , 1_2(246) -> 245 1125.86/297.10 , 1_2(261) -> 260 1125.86/297.10 , 0_0(1) -> 1 1125.86/297.10 , 0_1(1) -> 49 1125.86/297.10 , 0_1(5) -> 4 1125.86/297.10 , 0_1(9) -> 195 1125.86/297.10 , 0_1(12) -> 11 1125.86/297.10 , 0_1(18) -> 17 1125.86/297.10 , 0_1(19) -> 49 1125.86/297.10 , 0_1(22) -> 21 1125.86/297.10 , 0_1(33) -> 32 1125.86/297.10 , 0_1(34) -> 42 1125.86/297.10 , 0_1(35) -> 1 1125.86/297.10 , 0_1(35) -> 10 1125.86/297.10 , 0_1(35) -> 18 1125.86/297.10 , 0_1(35) -> 70 1125.86/297.10 , 0_1(35) -> 78 1125.86/297.10 , 0_1(35) -> 99 1125.86/297.10 , 0_1(35) -> 216 1125.86/297.10 , 0_1(40) -> 39 1125.86/297.10 , 0_1(44) -> 43 1125.86/297.10 , 0_1(48) -> 47 1125.86/297.10 , 0_1(49) -> 164 1125.86/297.10 , 0_1(50) -> 3 1125.86/297.10 , 0_1(55) -> 54 1125.86/297.10 , 0_1(56) -> 184 1125.86/297.10 , 0_1(59) -> 58 1125.86/297.10 , 0_1(61) -> 60 1125.86/297.10 , 0_1(63) -> 2 1125.86/297.10 , 0_1(66) -> 65 1125.86/297.10 , 0_1(70) -> 165 1125.86/297.10 , 0_1(72) -> 71 1125.86/297.10 , 0_1(73) -> 72 1125.86/297.10 , 0_1(79) -> 19 1125.86/297.10 , 0_1(83) -> 82 1125.86/297.10 , 0_1(85) -> 155 1125.86/297.10 , 0_1(90) -> 89 1125.86/297.10 , 0_1(92) -> 49 1125.86/297.10 , 0_1(106) -> 105 1125.86/297.10 , 0_1(109) -> 108 1125.86/297.10 , 0_1(114) -> 27 1125.86/297.10 , 0_1(117) -> 116 1125.86/297.10 , 0_1(127) -> 20 1125.86/297.10 , 0_1(148) -> 147 1125.86/297.10 , 0_1(149) -> 148 1125.86/297.10 , 0_1(155) -> 154 1125.86/297.10 , 0_1(165) -> 164 1125.86/297.10 , 0_1(168) -> 167 1125.86/297.10 , 0_1(174) -> 173 1125.86/297.10 , 0_1(180) -> 179 1125.86/297.10 , 0_1(184) -> 183 1125.86/297.10 , 0_1(187) -> 186 1125.86/297.10 , 0_1(189) -> 188 1125.86/297.10 , 0_1(191) -> 190 1125.86/297.10 , 0_1(194) -> 193 1125.86/297.10 , 0_1(196) -> 36 1125.86/297.10 , 0_1(201) -> 92 1125.86/297.10 , 0_1(204) -> 203 1125.86/297.10 , 0_2(211) -> 210 1125.86/297.10 , 0_2(220) -> 219 1125.86/297.10 , 0_2(229) -> 228 1125.86/297.10 , 0_2(238) -> 237 1125.86/297.10 , 0_2(245) -> 244 1125.86/297.10 , 0_2(255) -> 254 1125.86/297.10 , 0_2(260) -> 209 1125.86/297.10 , 0_2(267) -> 266 1125.86/297.10 , 3_0(1) -> 1 1125.86/297.10 , 3_1(1) -> 34 1125.86/297.10 , 3_1(7) -> 6 1125.86/297.10 , 3_1(10) -> 207 1125.86/297.10 , 3_1(11) -> 2 1125.86/297.10 , 3_1(14) -> 13 1125.86/297.10 , 3_1(16) -> 15 1125.86/297.10 , 3_1(20) -> 34 1125.86/297.10 , 3_1(26) -> 25 1125.86/297.10 , 3_1(30) -> 29 1125.86/297.10 , 3_1(31) -> 30 1125.86/297.10 , 3_1(34) -> 135 1125.86/297.10 , 3_1(35) -> 34 1125.86/297.10 , 3_1(36) -> 35 1125.86/297.10 , 3_1(38) -> 37 1125.86/297.10 , 3_1(52) -> 51 1125.86/297.10 , 3_1(55) -> 136 1125.86/297.10 , 3_1(56) -> 106 1125.86/297.10 , 3_1(57) -> 19 1125.86/297.10 , 3_1(58) -> 57 1125.86/297.10 , 3_1(62) -> 189 1125.86/297.10 , 3_1(68) -> 67 1125.86/297.10 , 3_1(69) -> 135 1125.86/297.10 , 3_1(70) -> 69 1125.86/297.10 , 3_1(72) -> 34 1125.86/297.10 , 3_1(75) -> 74 1125.86/297.10 , 3_1(92) -> 1 1125.86/297.10 , 3_1(92) -> 10 1125.86/297.10 , 3_1(92) -> 18 1125.86/297.10 , 3_1(92) -> 34 1125.86/297.10 , 3_1(92) -> 70 1125.86/297.10 , 3_1(92) -> 77 1125.86/297.10 , 3_1(92) -> 78 1125.86/297.10 , 3_1(92) -> 98 1125.86/297.10 , 3_1(92) -> 207 1125.86/297.10 , 3_1(92) -> 216 1125.86/297.10 , 3_1(96) -> 95 1125.86/297.10 , 3_1(99) -> 98 1125.86/297.10 , 3_1(104) -> 103 1125.86/297.10 , 3_1(111) -> 110 1125.86/297.10 , 3_1(112) -> 111 1125.86/297.10 , 3_1(113) -> 112 1125.86/297.10 , 3_1(115) -> 114 1125.86/297.10 , 3_1(119) -> 34 1125.86/297.10 , 3_1(125) -> 124 1126.20/297.10 , 3_1(130) -> 129 1126.20/297.10 , 3_1(136) -> 135 1126.20/297.10 , 3_1(153) -> 59 1126.20/297.10 , 3_1(159) -> 158 1126.20/297.10 , 3_1(166) -> 92 1126.20/297.10 , 3_1(171) -> 170 1126.20/297.10 , 3_1(186) -> 185 1126.20/297.10 , 3_1(195) -> 194 1126.20/297.10 , 3_1(200) -> 199 1126.20/297.10 , 3_1(206) -> 205 1126.20/297.10 , 3_2(143) -> 142 1126.20/297.10 , 3_2(144) -> 143 1126.20/297.10 , 3_2(213) -> 212 1126.20/297.10 , 3_2(222) -> 221 1126.20/297.10 , 3_2(231) -> 230 1126.20/297.10 , 3_2(240) -> 239 1126.20/297.10 , 3_2(244) -> 208 1126.20/297.10 , 3_2(250) -> 246 1126.20/297.10 , 3_2(253) -> 252 1126.20/297.10 , 3_2(264) -> 261 1126.20/297.10 , 4_0(1) -> 1 1126.20/297.10 , 4_1(1) -> 70 1126.20/297.10 , 4_1(9) -> 118 1126.20/297.10 , 4_1(10) -> 77 1126.20/297.10 , 4_1(15) -> 14 1126.20/297.10 , 4_1(19) -> 1 1126.20/297.10 , 4_1(19) -> 10 1126.20/297.10 , 4_1(19) -> 18 1126.20/297.10 , 4_1(19) -> 56 1126.20/297.10 , 4_1(19) -> 99 1126.20/297.10 , 4_1(19) -> 160 1126.20/297.10 , 4_1(19) -> 216 1126.20/297.10 , 4_1(23) -> 22 1126.20/297.10 , 4_1(24) -> 23 1126.20/297.10 , 4_1(25) -> 24 1126.20/297.10 , 4_1(34) -> 33 1126.20/297.10 , 4_1(41) -> 40 1126.20/297.10 , 4_1(43) -> 27 1126.20/297.10 , 4_1(46) -> 45 1126.20/297.10 , 4_1(49) -> 48 1126.20/297.10 , 4_1(56) -> 55 1126.20/297.10 , 4_1(60) -> 59 1126.20/297.10 , 4_1(65) -> 64 1126.20/297.10 , 4_1(78) -> 77 1126.20/297.10 , 4_1(86) -> 35 1126.20/297.10 , 4_1(93) -> 92 1126.20/297.10 , 4_1(94) -> 93 1126.20/297.10 , 4_1(108) -> 107 1126.20/297.10 , 4_1(121) -> 120 1126.20/297.10 , 4_1(123) -> 122 1126.20/297.10 , 4_1(124) -> 123 1126.20/297.10 , 4_1(129) -> 128 1126.20/297.10 , 4_1(136) -> 157 1126.20/297.10 , 4_1(154) -> 153 1126.20/297.10 , 4_1(158) -> 157 1126.20/297.10 , 4_1(160) -> 159 1126.20/297.10 , 4_1(173) -> 172 1126.20/297.10 , 4_1(175) -> 174 1126.20/297.10 , 4_1(179) -> 166 1126.20/297.10 , 4_1(185) -> 119 1126.20/297.10 , 4_1(188) -> 187 1126.20/297.10 , 4_1(198) -> 197 1126.20/297.10 , 4_1(205) -> 204 1126.20/297.10 , 4_2(145) -> 144 1126.20/297.10 , 4_2(252) -> 250 1126.20/297.10 , 4_2(272) -> 267 } 1126.20/297.10 1126.20/297.10 Hurray, we answered YES(?,O(n^1)) 1127.00/298.00 EOF