Problem A
Symmetric Order — Problem Statistics

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Submissions	14202
Accepted submissions	7810
Submission ratio	54.99%
Authors	7294
Full solves [?]	6876
Full solve Ratio	94.27%

#	User	Runtime	Language	Date
1	Danny Robinson	0.01 s	Bash	2023-09-01 12:01:56
2	Manish shrestha	0.01 s	Bash	2025-04-15 09:19:05

#	User	Runtime	Language	Date
1	Daouda Camara	0.02 s	C#	2015-09-19 17:41:04
2	Niklas Huss	0.02 s	C#	2015-09-19 21:10:37
3	Udgin Pyl	0.02 s	C#	2015-09-21 22:45:07
4	Ivan Joukov	0.02 s	C#	2015-09-29 05:30:23
5	David Bergman	0.02 s	C#	2015-10-03 20:59:08
6	Linda Hansson	0.02 s	C#	2015-10-07 11:59:07
7	Jens Mossig	0.02 s	C#	2015-10-16 09:19:22
8	Stefan Nordling	0.02 s	C#	2015-10-31 20:12:30
9	Jens Ronnqvist	0.02 s	C#	2015-12-11 14:49:05
10	Patrick Johannessen	0.02 s	C#	2015-12-15 01:33:22

#	User	Runtime	Language	Date
1	John Dandy	0.01 s	Common Lisp	2020-01-31 01:21:03
2	Kevin Jones	0.01 s	Common Lisp	2020-02-22 16:44:43
3	David Cawthon	0.01 s	Common Lisp	2020-06-25 03:05:01
4	Jinwoo Lee	0.01 s	Common Lisp	2020-09-30 04:58:56
5	Hidden user	0.01 s	Common Lisp	2022-08-22 22:51:10

#	User	Runtime	Language	Date
1	dick move	0.00 s	Crystal	2025-09-27 13:15:34

#	User	Runtime	Language	Date
1	Helgi Halldórsson	0.03 s	F#	2020-09-24 09:35:27
2	Jacob Harris Cryer Kragh	0.04 s	F#	2022-07-10 12:51:47

#	User	Runtime	Language	Date
1	Jimmy Nejtron	0.00 s	Go	2023-09-14 08:13:29
2	Kiki Ibrahim	0.00 s	Go	2024-06-01 03:05:58
3	n k	0.00 s	Go	2025-01-17 08:19:27
4	Theo Coyne Morgan	0.01 s	Go	2019-03-25 20:10:08
5	Markus Takalo	0.02 s	Go	2019-04-14 19:30:21
6	Manoj Lenka	0.02 s	Go	2020-06-06 08:51:18
7	Nimrod Yonatan Ben-Nes	0.02 s	Go	2020-07-05 13:42:56
8	Ainun Nazieb	0.02 s	Go	2020-08-27 09:14:30
9	Aurélien Brabant	0.02 s	Go	2020-11-11 13:37:43
10	Norbert Voelker	0.02 s	Go	2021-04-09 22:00:12

#	User	Runtime	Language	Date
1	Guangyi Zhou	0.04 s	Java	2025-02-13 13:22:34
2	Marco Vincenzo Karaan	0.05 s	Java	2015-09-19 17:09:18
3	Peter Steele	0.05 s	Java	2015-09-19 17:17:47
4	Love Engman	0.05 s	Java	2015-09-19 17:27:14
5	Chris Wu	0.05 s	Java	2015-09-19 17:31:14
6	Kevin Wang	0.05 s	Java	2015-09-19 17:35:47
7	Rupin Khera	0.05 s	Java	2015-09-19 18:20:19
8	Hidden user	0.05 s	Java	2015-09-19 19:13:12
9	Kyriakos Georgiou	0.05 s	Java	2015-09-19 21:42:52
10	Viktor Lindberg	0.05 s	Java	2015-09-19 22:31:53

#	User	Runtime	Language	Date
1	NNNNN	0.04 s	JavaScript (Node.js)	2024-01-20 16:30:17
2	Carl Sundvall	0.05 s	JavaScript (Node.js)	2018-10-28 20:15:16
3	Gurpartap Singh Bhatti	0.05 s	JavaScript (Node.js)	2019-03-07 04:35:40
4	José Lucas	0.05 s	JavaScript (Node.js)	2019-03-08 18:39:25
5	Sander Hellesø	0.05 s	JavaScript (Node.js)	2019-04-14 08:19:10
6	Hidden user	0.05 s	JavaScript (Node.js)	2019-06-04 21:35:07
7	Hidden user	0.05 s	JavaScript (Node.js)	2024-09-09 17:26:10
8	Chris Wong	0.41 s	JavaScript (Node.js)	2021-02-02 13:58:53
9	Stephanie Keck	0.42 s	JavaScript (Node.js)	2020-01-31 21:49:36
10	Youness Elaachiq	0.42 s	JavaScript (Node.js)	2020-02-06 21:49:57

#	User	Runtime	Language	Date
1	Bjørn Zeiler Hougaard	0.01 s	JavaScript (SpiderMonkey)	2015-11-10 20:55:17
2	Peter Kedemo	0.01 s	JavaScript (SpiderMonkey)	2015-12-17 22:13:16
3	Bjørn Chr. Soltvedt	0.01 s	JavaScript (SpiderMonkey)	2016-01-06 19:53:21
4	Mark Bouchkevitch	0.01 s	JavaScript (SpiderMonkey)	2016-01-21 18:05:38
5	Theodor Högberg	0.01 s	JavaScript (SpiderMonkey)	2016-02-05 14:41:45
6	Johannes Jensen	0.01 s	JavaScript (SpiderMonkey)	2016-03-05 21:25:37
7	Adam Murphy	0.01 s	JavaScript (SpiderMonkey)	2016-03-23 15:02:16
8	Gabriel Lau	0.01 s	JavaScript (SpiderMonkey)	2016-03-28 04:42:20
9	J M	0.01 s	JavaScript (SpiderMonkey)	2016-10-26 17:40:34
10	Tor Nordqvist	0.01 s	JavaScript (SpiderMonkey)	2016-11-08 12:40:41

#	User	Runtime	Language	Date
1	Timothy Gaede	0.64 s	Julia	2024-03-25 02:42:22
2	Danny Robinson	0.73 s	Julia	2023-09-01 11:18:31

#	User	Runtime	Language	Date
1	Leung arvin	0.11 s	Kotlin	2022-10-15 12:07:00
2	Albert Pala	0.12 s	Kotlin	2021-07-03 21:17:04
3	Jacob Huebner	0.14 s	Kotlin	2020-03-17 00:44:00
4	Kyle Laker	0.17 s	Kotlin	2018-01-23 21:29:33
5	Frangel Hernández Martinez	0.17 s	Kotlin	2018-04-25 15:12:45
6	Dmitry Shostak	0.17 s	Kotlin	2018-06-21 16:53:54
7	Dayan Ruben Gonzalez	0.17 s	Kotlin	2020-09-29 02:49:17
8	Whitt Sanders	0.18 s	Kotlin	2023-04-19 13:17:51
9	Jaedon Kee Shaowei	0.19 s	Kotlin	2019-07-16 12:09:20
10	Robert M	0.19 s	Kotlin	2023-03-06 21:48:06

#	User	Runtime	Language	Date
1	Ludovic Mignot	0.00 s	OCaml	2020-07-25 16:10:15
2	Runze Wang	0.00 s	OCaml	2020-11-07 15:29:50

#	User	Runtime	Language	Date
1	Ingemar Ragnemalm	0.00 s	Pascal	2017-08-07 06:53:20
2	Bách Nguyễn	0.00 s	Pascal	2017-12-20 12:06:45
3	David Connolly	0.00 s	Pascal	2022-04-05 15:16:37

#	User	Runtime	Language	Date
1	Saito Ta	0.00 s	Perl	2024-04-22 23:24:09

#	User	Runtime	Language	Date
1	Keith Morris	0.01 s	PHP	2015-10-03 00:26:09
2	Martin Dibakar Björling	0.01 s	PHP	2015-11-24 20:20:49
3	Silvena Lam	0.01 s	PHP	2016-02-03 07:01:04
4	Steven D. Wilson	0.01 s	PHP	2016-03-16 00:37:19
5	Hidden user	0.01 s	PHP	2018-03-28 01:38:55
6	Mohammed Yousif	0.01 s	PHP	2018-05-03 11:31:46
7	Petr Trofimov	0.01 s	PHP	2019-07-21 03:46:46
8	Jonas Lindenskov Nielsen	0.01 s	PHP	2019-09-14 21:34:17
9	Helbin Grégory	0.01 s	PHP	2020-02-02 12:35:56
10	Renate Fiala-Lundström	0.01 s	PHP	2021-04-20 15:02:58

#	User	Runtime	Language	Date
1	Hadi Qovaizi	0.01 s	Prolog	2016-04-21 23:18:28
2	Andriy Zyevakov	0.01 s	Prolog	2016-11-15 10:59:34
3	Hakan Kjellerstrand	0.03 s	Prolog	2023-01-30 17:07:22

#	User	Runtime	Language	Date
1	Jonathan Wan	0.02 s	Python 2	2015-09-19 17:42:53
2	Tore Norderud	0.02 s	Python 2	2015-09-20 02:35:33
3	Erik Odenman	0.02 s	Python 2	2015-09-20 13:04:28
4	Christofer Ohlsson	0.02 s	Python 2	2015-09-20 20:13:15
5	Carl Martin Rosenberg	0.02 s	Python 2	2015-10-01 15:40:46
6	Gustav Nelson Schneider	0.02 s	Python 2	2015-10-05 12:48:52
7	Blake Hawkins	0.02 s	Python 2	2015-10-21 22:58:50
8	Urban Pettersson	0.02 s	Python 2	2015-10-29 18:22:26
9	Hidden user	0.02 s	Python 2	2016-01-03 13:36:06
10	Alexander Teno	0.02 s	Python 2	2016-01-04 22:09:08

#	User	Runtime	Language	Date
1	Wen Li Looi	0.02 s	Python 3	2015-09-19 17:23:36
2	Johannes Agestam	0.02 s	Python 3	2015-09-20 12:35:35
3	John Harrison	0.02 s	Python 3	2015-09-30 00:08:54
4	Blake Hyde	0.02 s	Python 3	2015-10-03 19:48:51
5	Victor Zheng	0.02 s	Python 3	2015-10-03 23:53:03
6	John William O'Rourke	0.02 s	Python 3	2015-10-04 17:25:33
7	曾威凱	0.02 s	Python 3	2015-10-07 02:50:58
8	James Elías Sigurðarson	0.02 s	Python 3	2015-10-09 23:54:35
9	Hidden user	0.02 s	Python 3	2015-10-10 17:45:47
10	Emil Riis Hansen	0.02 s	Python 3	2015-10-13 13:32:15

#	User	Runtime	Language	Date
1	Charlie Egan	0.03 s	Ruby	2015-09-28 18:49:48
2	Casper Christensen	0.03 s	Ruby	2016-02-04 11:58:04
3	Lasse Berglund	0.03 s	Ruby	2016-03-28 05:22:06
4	Kellen Watt	0.03 s	Ruby	2016-04-18 04:32:23
5	Erik Rydbert	0.03 s	Ruby	2016-07-07 03:22:29
6	Leonardo Brito	0.03 s	Ruby	2017-01-03 05:23:04
7	Kevin Suwala	0.03 s	Ruby	2017-01-08 21:03:47
8	Sonam Tenzin	0.03 s	Ruby	2017-07-11 12:30:38
9	John Bowers	0.03 s	Ruby	2018-01-24 03:37:30
10	Paul Vinell	0.03 s	Ruby	2018-03-30 22:37:15

#	User	Runtime	Language	Date
1	Joe Blower	0.00 s	Zig	2025-05-23 16:22:06

#	User	Length	Language	Date
1	Danny Robinson	109	Bash	2023-09-01 12:01:56
2	Manish shrestha	501	Bash	2025-04-15 09:19:05

#	User	Length	Language	Date
1	Martin Blom	214	C	2023-10-16 17:49:53
2	Thibault Raffaillac	300	C	2016-05-25 15:54:05
3	Daniel Christopher Kesuma	340	C	2020-12-22 04:43:31
4	Sura Hasith	344	C	2017-05-04 15:05:44
5	Lawrence Li	360	C	2016-01-12 10:04:37
6	Wesley Stephanak	361	C	2019-02-06 01:46:12
7	Stephen Nicholas	364	C	2018-11-22 17:31:32
8	Mark Froilan Tandoc	380	C	2015-10-05 11:52:54
9	Marcus Wanner	389	C	2015-09-19 17:51:17
10	Haobo Jiang	393	C	2015-10-19 14:02:02

#	User	Length	Language	Date
1	Anthony Ye	465	C#	2023-01-22 17:43:27
2	Esty Crow	493	C#	2023-01-18 01:46:50
3	Göran Andersson	666	C#	2022-05-09 20:31:07
4	Lars-Håkon Nystad	673	C#	2021-02-10 09:51:59
5	Fernanda Ferrer Ortega	695	C#	2023-03-23 00:38:55
6	Steve Jia	696	C#	2018-09-06 16:28:35
7	Gretel Rojas	710	C#	2023-02-28 02:33:59
8	Santiago Sarabia Martínez	710	C#	2023-04-21 06:49:44
9	Shaun Lazaro	712	C#	2016-11-26 21:03:15
10	Kunwei Zhang	718	C#	2018-02-04 08:49:45

#	User	Length	Language	Date
1	Taylor Rodríguez	204	C++	2024-10-28 07:47:31
2	Bbshsh Si	309	C++	2022-06-09 15:00:18
3	Đậu Huy Minh	317	C++	2022-10-10 08:32:21
4	William Gan	325	C++	2016-03-23 06:55:05
5	Eyob Tariku	328	C++	2023-06-24 12:06:07
6	Edward Keitaro	334	C++	2018-04-17 07:05:57
7	鹿目圆	334	C++	2018-11-24 19:37:23
8	Johan Wind	336	C++	2015-09-20 18:42:49
9	Li Jiayu	338	C++	2021-12-03 09:50:00
10	Syx Pek	343	C++	2016-01-14 17:27:19

#	User	Length	Language	Date
1	John Dandy	382	Common Lisp	2020-01-31 01:21:03
2	Kevin Jones	440	Common Lisp	2020-02-22 16:44:43
3	David Cawthon	551	Common Lisp	2020-06-25 03:05:01
4	Hidden user	661	Common Lisp	2022-08-22 22:51:10
5	Jinwoo Lee	669	Common Lisp	2020-09-30 04:58:56

#	User	Length	Language	Date
1	dick move	294	Crystal	2025-09-27 13:15:34

#	User	Length	Language	Date
1	Jacob Harris Cryer Kragh	547	F#	2022-07-10 12:51:47
2	Helgi Halldórsson	842	F#	2020-09-24 09:35:27

#	User	Length	Language	Date
1	Andrew Gemmel	385	Go	2022-12-06 03:02:35
2	Hidden user	389	Go	2021-12-18 14:15:32
3	Kellen Watt	390	Go	2015-09-30 00:33:59
4	Fahmi Ardhianto	405	Go	2020-08-22 07:10:57
5	Theo Coyne Morgan	462	Go	2019-03-25 20:10:08
6	Aurélien Brabant	468	Go	2020-11-11 13:37:43
7	Ian Howell	483	Go	2016-05-24 03:32:56
8	Nimrod Yonatan Ben-Nes	548	Go	2020-07-05 13:42:56
9	Krzysztof Gibuła	560	Go	2019-02-26 21:45:34
10	Hidden user	608	Go	2017-11-03 21:39:13

#	User	Length	Language	Date
1	Sebastian Banert	265	Haskell	2023-04-22 11:11:46
2	Monique Oliveira	308	Haskell	2021-07-15 02:22:12
3	David Wärn	328	Haskell	2015-10-25 13:24:37
4	Freek van Keulen	334	Haskell	2021-02-08 13:19:27
5	Patrick Bahr	394	Haskell	2018-11-24 14:38:30
6	Lars Tveito	397	Haskell	2015-09-19 18:03:29
7	Carl Agrell	399	Haskell	2016-09-28 15:53:55
8	Michael Gilliland	408	Haskell	2020-11-04 17:19:26
9	Brent Yorgey	420	Haskell	2017-10-01 15:00:08
10	Lieven Marchand	445	Haskell	2017-08-22 10:14:45

#	User	Length	Language	Date
1	Hridyanshu Aatreya	393	Java	2023-04-05 09:10:46
2	Robert Slutsky	468	Java	2018-01-22 21:55:49
3	hassoun karoum	488	Java	2020-02-17 12:29:21
4	Destiny S Mhishi	499	Java	2016-01-14 07:17:37
5	Duncan Page	510	Java	2018-11-19 23:32:06
6	Felix Burie	512	Java	2016-12-20 21:32:34
7	Jason Tomkins	516	Java	2018-12-24 07:06:49
8	Kim Hua, Michael Lee	517	Java	2016-01-06 14:38:54
9	daffa fathani adila	517	Java	2021-02-05 14:10:36
10	Darryl James	528	Java	2020-12-12 17:30:06

#	User	Length	Language	Date
1	Gurpartap Singh Bhatti	765	JavaScript (Node.js)	2019-03-07 04:49:38
2	Hidden user	787	JavaScript (Node.js)	2020-12-30 01:09:48
3	Antoine Bauri	824	JavaScript (Node.js)	2021-02-14 12:40:38
4	Tobias Lans	839	JavaScript (Node.js)	2021-04-08 15:13:54
5	Michael Zetterholm	854	JavaScript (Node.js)	2020-09-22 12:18:00
6	Hidden user	874	JavaScript (Node.js)	2023-08-04 15:37:40
7	José Lucas	911	JavaScript (Node.js)	2019-03-08 18:39:25
8	Chris Wong	920	JavaScript (Node.js)	2021-02-02 13:58:53
9	Sander Hellesø	1049	JavaScript (Node.js)	2019-04-14 08:19:10
10	Andoko Chandra	1072	JavaScript (Node.js)	2020-10-07 08:35:53

#	User	Length	Language	Date
1	Jimmy Gustafsson	179	JavaScript (SpiderMonkey)	2024-06-11 19:38:51
2	Gabriel Lau	280	JavaScript (SpiderMonkey)	2016-03-28 04:42:20
3	Christian Pilegaard Cederquist	337	JavaScript (SpiderMonkey)	2022-11-10 09:25:54
4	Evan Magill	359	JavaScript (SpiderMonkey)	2024-04-20 05:23:21
5	Johannes Jensen	380	JavaScript (SpiderMonkey)	2016-03-05 21:25:37
6	Nguyễn Hùng Cường	380	JavaScript (SpiderMonkey)	2018-09-03 13:01:43
7	Peter Kedemo	388	JavaScript (SpiderMonkey)	2015-12-17 22:13:16
8	Theodor Högberg	393	JavaScript (SpiderMonkey)	2016-02-05 14:41:45
9	J M	393	JavaScript (SpiderMonkey)	2016-10-26 17:40:34
10	Bernard Perrin	405	JavaScript (SpiderMonkey)	2019-02-06 21:19:39

#	User	Length	Language	Date
1	Danny Robinson	131	Julia	2023-09-01 11:18:31
2	Timothy Gaede	1984	Julia	2024-03-25 02:42:22

#	User	Length	Language	Date
1	Yang Tang	342	Kotlin	2023-07-24 07:05:41
2	Dayan Ruben Gonzalez	482	Kotlin	2020-09-29 02:49:17
3	Troy Warmboe	522	Kotlin	2020-02-05 21:02:44
4	Chris Johnson	543	Kotlin	2024-09-13 20:25:28
5	Dmitry Shostak	561	Kotlin	2018-06-21 16:53:54
6	Alice Darner	572	Kotlin	2021-04-16 10:28:28
7	Jonas Hartmann Andersen	659	Kotlin	2019-12-23 21:14:47
8	Kyle Laker	668	Kotlin	2018-01-23 21:29:33
9	Adam Rankin	705	Kotlin	2023-05-05 01:22:44
10	Robert M	716	Kotlin	2023-03-06 21:48:06

#	User	Length	Language	Date
1	Ludovic Mignot	475	OCaml	2020-07-25 16:10:15
2	Runze Wang	639	OCaml	2020-11-07 15:29:50

#	User	Length	Language	Date
1	Ingemar Ragnemalm	494	Pascal	2017-08-07 06:53:20
2	David Connolly	579	Pascal	2022-04-05 15:16:37
3	Bách Nguyễn	982	Pascal	2017-12-20 12:06:45

#	User	Length	Language	Date
1	Saito Ta	134	Perl	2024-04-22 23:24:09

#	User	Length	Language	Date
1	Keith Morris	506	PHP	2015-10-03 00:26:09
2	Mohammed Yousif	508	PHP	2018-05-03 11:31:46
3	Petr Trofimov	508	PHP	2019-07-21 03:46:46
4	Renate Fiala-Lundström	684	PHP	2021-04-20 15:02:58
5	Steven D. Wilson	703	PHP	2016-03-16 00:37:19
6	Hidden user	740	PHP	2018-03-28 01:38:55
7	Jonas Lindenskov Nielsen	817	PHP	2019-09-14 21:34:17
8	Martin Dibakar Björling	928	PHP	2015-11-24 20:20:49
9	Helbin Grégory	1046	PHP	2020-02-02 12:35:56
10	Silvena Lam	1362	PHP	2016-02-03 07:01:04

#	User	Length	Language	Date
1	Andriy Zyevakov	526	Prolog	2016-11-15 10:59:34
2	Hakan Kjellerstrand	682	Prolog	2023-01-30 17:07:22
3	Hadi Qovaizi	10059	Prolog	2016-04-21 23:18:28

#	User	Length	Language	Date
1	Thomas Feld	151	Python 2	2019-08-19 10:31:03
2	Bryan Poulsen	183	Python 2	2017-03-02 03:20:01
3	Jeff Robertson	184	Python 2	2017-04-29 17:48:57
4	Bryan Poulsen	190	Python 2	2021-11-29 20:34:55
5	Hubert Teo	210	Python 2	2017-02-18 09:41:33
6	Hidden user	215	Python 2	2016-12-27 13:37:46
7	James Hamm	223	Python 2	2016-12-16 00:15:36
8	Erik Odenman	251	Python 2	2015-09-20 13:04:28
9	Paweł Kordowski	252	Python 2	2015-11-28 09:43:45
10	Иззатбек Муханов	258	Python 2	2016-05-25 15:43:58

#	User	Length	Language	Date
1	Clement Oh	88	Python 3	2023-07-17 07:59:55
2	Lawry Sorenson	96	Python 3	2023-08-20 03:14:18
3	Benjamin Z White	106	Python 3	2023-04-18 19:13:56
4	Thomas Feld	113	Python 3	2022-11-04 12:50:22
5	Kevin Gomez	121	Python 3	2024-06-13 04:50:08
6	Magnus Hokland Hegdahl	134	Python 3	2023-11-15 23:52:13
7	Tai Tze Kin	141	Python 3	2024-05-01 14:03:36
8	Ryan Farrell	142	Python 3	2024-01-05 00:10:33
9	Andrew He	153	Python 3	2016-08-11 20:33:35
10	Charles Ancheta	154	Python 3	2023-03-27 19:54:08

#	User	Length	Language	Date
1	Thomas Feld	71	Ruby	2023-07-23 22:48:33
2	Alexander Bilde Pedersen	225	Ruby	2023-05-13 23:20:43
3	Jason Cheong-Kee-You	239	Ruby	2018-05-28 02:11:10
4	Hidden user	263	Ruby	2019-02-16 17:02:17
5	Paul Vinell	272	Ruby	2018-03-30 22:37:15
6	Sonam Tenzin	275	Ruby	2017-07-11 12:30:38
7	Donald Dong	275	Ruby	2018-11-19 05:02:24
8	Kellen Watt	278	Ruby	2016-04-18 04:32:23
9	Olivia Bednar	278	Ruby	2019-09-05 20:25:47
10	Martin Muñoz	303	Ruby	2020-12-28 04:59:20

#	User	Length	Language	Date
1	Emil Dichmann	658	Rust	2025-09-30 11:08:10
2	Chaoyi Yin	692	Rust	2019-03-20 18:44:21
3	Adam Ehlers Nyholm Thomsen	693	Rust	2020-12-16 19:21:04
4	Kok Dith	745	Rust	2021-08-05 06:38:02
5	Artur Khuziakhmetov	761	Rust	2022-08-04 06:59:54
6	Louis Ma	788	Rust	2021-02-03 05:42:41
7	Andriy Semenistiy	816	Rust	2021-02-15 20:32:36
8	Hidden user	849	Rust	2019-04-30 14:10:50
9	Bas Dirks	869	Rust	2022-01-09 08:36:51
10	Andra Antariksa	903	Rust	2019-03-20 00:12:39

#	User	Length	Language	Date
1	Joe Blower	1213	Zig	2025-05-23 16:22:06

Solution running time distribution