Task: Error-Detect (source dataset: Relational-Tables)

Task: 
You are given a column of data from a table. Your job is to examine each value in the column, and identify if there is any clear data error in the column. An data error in the context of the column, can be values that are misspelled (typos), values that are formatted incorrectly, or values that are semantically incompatible with the rest of the column, etc., such that we can determine without ambiguity that such values are errors in the column. 

Since real-world data can vary widely in meaning and format, if you are uncertain whether a value is an error, please do not mark it as one. Only flag a value if you are confident that it is clearly a data error.

No explanation and return the final answer as a JSON object, {"obvious_error": "<CELL>"}. If you detect no error in the data, return {"obvious_error": null}.

Column:
| customer id   |
|:--------------|
| c1367         |
| c1552         |
| c1560         |
| c1270         |
| c1146         |
| c1640         |
| c1126         |
| c1088         |
| c1637         |
| c1729         |
| c1093         |
| c1744         |
| c1068         |
| c1046         |
| c1109         |
| c1378         |
| c1003         |
| c1219         |
| c1130         |
| c1206         |
| c1716         |
| c1438         |
| c1370         |
| c1545         |
| c1261         |
| c1543         |
| c1148         |
| c1041         |
| c1769         |
| c1143         |
| c1002         |
| c1532         |
| c1374         |
| c1325         |
| c1601         |
| c1115         |
| c1015         |
| c1685         |
| c1574         |
| c1371         |
| c1327         |
| c1571         |
| c1774         |
| c1777         |
| c1284         |
| c1632         |
| c1100         |
| c1344         |
| c1608         |
| c1619         |
| c1417         |
| c1671         |
| c1098         |
| c1189         |
| c1771         |
| c1645         |
| c1715         |
| c1693         |
| c1549         |
| c1689         |
| c1108         |
| c1679         |
| c1274         |
| c1364         |
| c1732         |
| c1526         |
| c1358         |
| c1222         |
| c1043         |
| c1047         |
| c1538         |
| c1446         |
| c1233         |
| c1171         |
| c1436         |
| c1770         |
| c1788         |
| c1529         |
| c1369         |
| c1658         |
| c1157         |
| c1029         |
| c1161         |
| c1648         |
| c1499         |
| c1073         |
| c1475         |
| c1095         |
| c1244         |
| c1407         |
| c1110         |
| c1635         |
| c1392         |
| c1746         |
| c1798         |
| c1107         |
| c1141         |
| c1054         |
| c1196         |
| c1654         |
| c1037         |
| c1334         |
| c1190         |
| c1442         |
| c1335         |
| c1038         |
| c1125         |
| c1032         |
| c1655         |
| c1296         |
| c1626         |
| c1195         |
| c1035         |
| c1500         |
| c1414         |
| c1285         |
| c1235         |
| c1260         |
| c1728         |
| c1279         |
| c1255         |
| c1761         |
| c1200         |
| c1613         |
| c1283         |
| c1056         |
| c1536         |
| c1576         |
| c1128         |
| c1336         |
| c1309         |
| c1506         |
| c1670         |
| c1783         |
| c1106         |
| c1702         |
| c1236         |
| c1345         |
| c1712         |
| c1387         |
| c1467         |
| c1267         |
| c1076         |
| c1605         |
| c1225         |
| c1300         |
| c1150         |
| c1373         |
| c1650         |
| c1649         |
| c1288         |
| c1741         |
| c1082         |
| c1419         |
| c1707         |
| c1787         |
| c1159         |
| c1338         |
| c1400         |
| c1781         |
| c1151         |
| c1525         |
| c1202         |
| c1800         |
| c1135         |
| c1697         |
| c1606         |
| c1793         |
| c1504         |
| c1096         |
| c1139         |
| c1181         |
| c1134         |
| c1454         |
| c1050         |
| c1478         |
| c1223         |
| c1622         |
| c1216         |
| c1524         |
| c1273         |
| c1329         |
| c1275         |
| c1473         |
| c1231         |
| c1333         |
| c1559         |
| c1332         |
| c1573         |
| c1121         |
| c1342         |
| c1057         |
| c1198         |
| c1366         |
| c1160         |
| c1186         |
| c1631         |
| c1763         |
| c1201         |
| c1304         |
| c1737         |
| c1104         |
| c1240         |
| c1508         |
| c1355         |
| c1119         |
| c1291         |
| c1791         |
| c1340         |
| c1034         |
| c1547         |
| c1742         |
| c1785         |
| c1301         |
| c1496         |
| c1239         |
| c1511         |
| c1730         |
| c1072         |
| c1251         |
| c1040         |
| c1321         |
| c1265         |
| c1740         |
| c1368         |
| c1568         |
| c1016         |
| c1580         |
| c1566         |
| c1214         |
| c1276         |
| c1254         |
| c1618         |
| c1708         |
| c1360         |
| c1228         |
| c1306         |
| c1025         |
| c1528         |
| c1558         |
| c1572         |
| c1664         |
| c1356         |
| c1210         |
| c1051         |
| c1449         |
| c1316         |
| c1610         |
| c1237         |
| c1377         |
| c1482         |
| c1389         |
| c1083         |
| c1081         |
| c1313         |
| c1263         |
| c1423         |
| c1347         |
| c1420         |
| c1718         |
| c1132         |
| c1158         |
| c1014         |
| c1127         |
| c1776         |
| c1484         |
| c1122         |
| c1709         |
| c1220         |
| c1175         |
| c1611         |
| c1162         |
| c1567         |
| c1722         |
| c1007         |
| c1382         |
| c1354         |
| c1105         |
| c1176         |
| c1412         |
| c1786         |
| c1457         |
| c1659         |
| c1359         |
| c1517         |
| c1690         |
| c1372         |
| c1271         |
| c1154         |
| c1683         |
| c1488         |
| c1257         |
| c1397         |
| c1113         |
| c1766         |
| c1687         |
| c1426         |
| c1179         |
| c1193         |
| c1428         |
| c1227         |
| c1444         |
| c1388         |
| c1246         |
| c1660         |
| c1462         |
| c1621         |
| c1294         |
| c1099         |
| c1736         |
| c1023         |
| c1669         |
| c1197         |
| c1458         |
| c1582         |
| c1063         |
| c1555         |
| c1166         |
| c1314         |
| c1599         |
| c1084         |
| c1021         |
| c1450         |
| c1546         |
| c1490         |
| c1527         |
| c1578         |
| c1530         |
| c1030         |
| c1661         |
| c1006         |
| c1264         |
| c1503         |
| c1268         |
| c1623         |
| c1749         |
| c1597         |
| c1760         |
| c1673         |
| c1027         |
| c1653         |
| c1755         |
| c1464         |
| c1542         |
| c1140         |
| c1182         |
| c1723         |
| c1433         |
| c1570         |
| c1293         |
| c1131         |
| c1247         |
| c1145         |
| c1614         |
| c1445         |
| c1714         |
| c1575         |
| c1238         |
| c1651         |
| c1184         |
| c1720         |
| c1652         |
| c1699         |
| c1451         |
| c1667         |
| c1724         |
| c1657         |
| c1005         |
| c1252         |
| c1018         |
| c1348         |
| c1594         |
| c1209         |
| c1026         |
| c1049         |
| c1022         |
| c1172         |
| c1289         |
| c1672         |
| c1609         |
| c1750         |
| c1248         |
| c1357         |
| c1554         |
| c1620         |
| c1302         |
| c1596         |
| c1194         |
| c1550         |
| c1039         |
| c1102         |
| c1249         |
| c1519         |
| c1778         |
| c1677         |
| c1326         |
| c1719         |
| c1408         |
| c1052         |
| c1234         |
| c1183         |
| c1045         |
| c1343         |
| c1298         |
| c1682         |
| c1434         |
| c1587         |
| c1185         |
| c1103         |
| c1735         |
| c1361         |
| c1470         |
| c1513         |
| c1205         |
| c1625         |
| c1489         |
| c1169         |
| c1514         |
| c1094         |
| c1486         |
| c1402         |
| c1531         |
| c1551         |
| c1461         |
| c1224         |
| c1675         |
| c1562         |
| c1211         |
| c1535         |
| c1071         |
| c1317         |
| c1762         |
| c1561         |
| c1753         |
| c1537         |
| c1036         |
| c1090         |
| c1540         |
| c1384         |
| c1656         |
| c1217         |
| c1069         |
| c1058         |
| c1299         |
| c1245         |
| c1386         |
| c1062         |
| c1579         |
| c1600         |
| c1156         |
| c1286         |
| c1586         |
| c1353         |
| c1000         |
| c1548         |
| c1662         |
| c1455         |
| c1011         |
| c1363         |
| c1759         |
| c1569         |
| c1070         |
| c1756         |
| c1704         |
| c1775         |
| c1463         |
| c1155         |
| c1324         |
| c1004         |
| c1009         |
| c1591         |
| c1079         |
| c1441         |
| c1013         |
| c1495         |
| c1678         |
| c1322         |
| c1443         |
| c1312         |
| c1307         |
| c1479         |
| c1391         |
| c1048         |
| c1078         |
| c1381         |
| c1681         |
| c1604         |
| c1401         |
| c1520         |
| c1703         |
| c1287         |
| c1111         |
| c1213         |
| c1588         |
| c1522         |
| c1497         |
| c1494         |
| c1585         |
| c1598         |
| c1167         |
| c1612         |
| c1515         |
| c1243         |
| c1523         |
| c1628         |
| c1282         |
| c1487         |
| c1061         |
| c1024         |
| c1319         |
| c1430         |
| c1221         |
| c1398         |
| c1178         |
| c1448         |
| c1077         |
| c1469         |
| c1676         |
| c1435         |
| c1215         |
| c1376         |
| c1634         |
| c1394         |
| c1137         |
| c1758         |
| c1686         |
| c1204         |
| c1118         |
| c1498         |
| c1292         |
| c1101         |
| c1305         |
| c1379         |
| c1059         |
| c1380         |
| c1507         |
| c1431         |
| c1472         |
| c1365         |
| c1593         |
| c1173         |
| c1192         |
| c1318         |
| c1278         |
| c1432         |
| c1396         |
| c1466         |
| c1337         |
| c1010         |
| c1772         |
| c1144         |
| c1533         |
| c1643         |
| c1607         |
| c1311         |
| c1505         |
| c1584         |
| c1352         |
| c1539         |
| c1638         |
| c1087         |
| c1624         |
| c1616         |
| c1168         |
| c1012         |
| c1481         |
| c1199         |
| c1691         |
| c1680         |
| c1752         |
| c1733         |
| c1666         |
| c1794         |
| c1617         |
| c1743         |
| c1208         |
| c1565         |
| c1789         |
| c1589         |
| c1627         |
| c1439         |
| c1152         |
| c1595         |
| c1416         |
| c1226         |
| c1483         |
| c1440         |
| c1692         |
| c1242         |
| c1136         |
| c1460         |
| c1339         |
| c1710         |
| c1796         |
| c1281         |
| c1060         |
| c1080         |
| c1544         |
| c1534         |
| c1476         |
| c1028         |
| c1362         |
| c1592         |
| c1738         |
| c1688         |
| c1602         |
| c1149         |
| c1390         |
| c1739         |
| c1258         |
| c1480         |
| c1493         |
| c1044         |
| c1303         |
| c1684         |
| c1308         |
| c1501         |
| c1663         |
| c1212         |
| c1447         |
| c1795         |
| c1453         |
| c1064         |
| c1471         |
| c1165         |
| c1557         |
| c1713         |
| c1541         |
| c1280         |
| c1764         |
| c1696         |
| c1521         |
| c1120         |
| c1668         |
| c1583         |
| c1773         |
| c1564         |
| c1721         |
| c1674         |
| c1706         |
| c1266         |
| c1779         |
| c1751         |
| c1477         |
| c1731         |
| c1563         |
| c1485         |
| c1253         |
| c1509         |
| c1629         |
| c1262         |
| c1502         |
| c1630         |
| c1019         |
| c1310         |
| c1424         |
| c1784         |
| c1232         |
| c1725         |
| c1452         |
| c1055         |
| c1067         |
| c1581         |
| c1474         |
| c1748         |
| c1409         |
| c1256         |
| c1415         |
| c1330         |
| c1295         |
| c1229         |
| c1138         |
| c1097         |
| c1790         |
| c1218         |
| c1577         |
| c1017         |
| c1250         |
| c1421         |
| c1399         |
| c1780         |
| c1427         |
| c1153         |
| c1188         |
| c1117         |
| c1147         |
| c1411         |
| c1510         |
| c1701         |
| c1465         |
| c1405         |
| c1346         |
| c1174         |
| c1422         |
| c1114         |
| c1053         |
| c1711         |
| c1086         |
| c1385         |
| c1177         |
| c1406         |
| c1639         |
| c1142         |
| c1085         |
| c1556         |
| c1726         |
| c1375         |
| c1437         |
| c1350         |
| c1066         |
| c1665         |
| c1633         |
| c1341         |
| c1747         |
| c1459         |
| c1207         |
| c1124         |
| c1091         |
| c1603         |
| c1163         |
| c1765         |
| c1133         |
| c1008         |
| c1075         |
| c1491         |
| c1241         |
| c1191         |
| c1492         |
| c1403         |
| c1646         |
| c1116         |
| c1698         |
| c1410         |
| c1290         |
| c1180         |
| c1269         |
| c1187         |
| c1727         |
| c1782         |
| c1799         |
| c1230         |
| c1705         |
| c1031         |
| c1695         |
| c1792         |
| c1516         |
| c1590         |
| c1767         |
| c1170         |
| c1418         |
| c1328         |
| c1425         |
| c1123         |
| c1615         |
| c1694         |
| c1518         |
| c1636         |
| c1644         |
| c1259         |
| c1164         |
| c1315         |
| c1297         |
| c1404         |
| c1757         |
| c1383         |
| c1754         |
| c1112         |
| c1349         |
| c1033         |
| c1042         |
| c1020         |
| c1001         |
| c1717         |
| c1092         |
| c1395         |
| c1512         |
| c1331         |
| c1768         |
| c1429         |
| c1203         |
| c1647         |
| c1642         |
| c1413         |
| c1323         |
| c1797         |
| c1468         |
| c1351         |
| c1700         |
| c1393         |
| c1129         |
| c1553         |
| c1089         |
| c1272         |
| c1065         |