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:
| cust_key              |
|:----------------------|
| 299901-gmbh_d6816001  |
| 299901-gmbh_n3013003  |
| 299901-gpauk_k01682   |
| 299901-gpauk_f006711  |
| 299901-gpauk_s000003  |
| 299901-gmbh_a4062000  |
| 299901-gmbh_n1620000  |
| 299901-gpai_nraida    |
| 299901-gpauk_b055554  |
| 299901-gpai_nrsky     |
| 299901-gmbh_a4169000  |
| 299901-gpauk_k01075   |
| 299901-gmbh_a3026000  |
| 299901-gpai_nrhighe   |
| 299901-gmbh_c5042000  |
| 299901-gmbh_n5040000  |
| 299901-gmbh_d6427000  |
| 299901-gpai_nrsigma   |
| 299901-gpauk_k01155   |
| 299901-gmbh_n3030000  |
| 299901-gmbh_p5120000  |
| 299901-gpauk_b054121  |
| 299901-gpauk_f006574  |
| 299901-gmbh_d6857000  |
| 299901-gmbh_d6023000  |
| 299901-gpauk_f006925  |
| 299901-gpauk_f007162  |
| 299901-gmbh_p5054000  |
| 299901-gpauk_f007172  |
| 299901-gpauk_f007251  |
| 299901-gpauk_k00422   |
| 299901-gmbh_d6752000  |
| 299901-gmbh_n5215000  |
| 299901-gmbh_c4299000  |
| 299901-gmbh_n1310000  |
| 299901-gpauk_f007118  |
| 299901-gpauk_k00038   |
| 299901-gpauk_k00590   |
| 299901-gpai_nrneby0   |
| 299901-gpauk_b054158  |
| 299901-gmbh_d6924000  |
| 299901-gpauk_d000007  |
| 299901-gpauk_d000002  |
| 299901-gpai_nrtsm     |
| 299901-gmbh_d6483000  |
| 299901-gpauk_l054004  |
| 299901-gmbh_n3565000  |
| 299901-gpauk_b055433  |
| 299901-gpauk_b055552  |
| 299901-gpauk_b054036  |
| 299901-gpauk_f007116  |
| 299901-gpauk_b054005  |
| 299901-gpauk_b055540  |
| 299901-gmbh_d7257001  |
| 299901-gmbh_d6445000  |
| 299901-gmbh_n6475000  |
| 299901-gmbh_d7390000  |
| 299901-gmbh_n5213000  |
| 299901-gmbh_d6086000  |
| 299901-gmbh_n6662000  |
| 299901-gpauk_k00480   |
| 299901-gpauk_f007205  |
| 299901-gmbh_d7223000  |
| 299901-gpauk_b055550  |
| 299901-gpauk_b055522  |
| 299901-gmbh_d6221000  |
| 299901-gpauk_s000012  |
| 299901-gmbh_d6201000  |
| 299901-gmbh_d7363000  |
| 299901-gmbh_d7229000  |
| 299901-gpauk_b055534  |
| 299901-gpai_nrdigit   |
| 299901-gmbh_d6098000  |
| 299901-gmbh_n2518000  |
| 299901-gpauk_k01550   |
| 299901-gpauk_f006871  |
| 299901-gmbh_d6407000  |
| 299901-gmbh_d6262000  |
| 299901-gpauk_k00997   |
| 299901-gmbh_d7011000  |
| 299901-gmbh_n1170000  |
| 299901-gpauk_k01164   |
| 299901-gpauk_k00018   |
| 299901-gmbh_n6822000  |
| 299901-gpai_nrhifigh  |
| 299901-gpauk_k01672   |
| 299901-gmbh_n6474000  |
| 299901-gpauk_k00873   |
| 299901-gpauk_k01200   |
| 299901-gpauk_k01642   |
| 299901-gmbh_c6440000  |
| 299901-gmbh_d6251000  |
| 299901-gpauk_k01560   |
| 299901-gmbh_d6173000  |
| 299901-gpai_nrperfec  |
| 299901-gpauk_k00892   |
| 299901-gpauk_k01119   |
| 299901-gpauk_k00245   |
| 299901-gmbh_d6899000  |
| 299901-gpai_nrmms     |
| 299901-gpauk_s000001  |
| 299901-gmbh_d6065000  |
| 299901-gpai_nrorion7  |
| 299901-gmbh_d6316000  |
| 299901-gpauk_g01800   |
| 299901-gmbh_n6333600  |
| 299901-gpauk_b055497  |
| 299901-gpauk_s000016  |
| 299901-gpai_nravstor  |
| 299901-gpauk_f006567  |
| 299901-gmbh_c4888000  |
| 299901-gpai_nrlux     |
| 299901-gpauk_n01800   |
| 299901-gmbh_c4997000  |
| 299901-gpauk_b055493  |
| 299901-gpauk_s000002  |
| 299901-gpauk_f006924  |
| 299901-gpauk_f006511  |
| 299901-gpai_nrplay    |
| 299901-gpai_nrinfini  |
| 299901-gpauk_b055455  |
| 299901-gpauk_f01800   |
| 299901-gmbh_p5047000  |
| 299901-gpauk_f006575  |
| 299901-gmbh_p5039000  |
| 299901-gmbh_p5233001  |
| 299901-gpauk_b055551  |
| 299901-gmbh_c5044000  |
| 299901-gpauk_d000010  |
| 299901-gmbh_d6339000  |
| 299901-gmbh_d6670000  |
| 299901-gmbh_d6035000  |
| 299901-gmbh_d6174000  |
| 299901-gmbh_d6178000  |
| 299901-gmbh_n4462000  |
| 299901-gmbh_d6669002  |
| 299901-gmbh_d6267000  |
| 299901-gmbh_d6192000  |
| 299901-gpauk_k01160   |
| 299901-gmbh_d7178000  |
| 299901-gmbh_d7002000  |
| 299901-gmbh_n8243000  |
| 299901-gmbh_d6064000  |
| 299901-gmbh_d6256000  |
| 299901-gmbh_d7066001  |
| 299901-gmbh_n6474002  |
| 299901-gmbh_n3050000  |
| 299901-gpauk_k01560/2 |
| 299901-gmbh_n8930001  |
| 299901-gmbh_d7014000  |
| 299901-gmbh_n5706000  |
| 299901-gmbh_d7150000  |
| 299901-gpauk_k01690   |
| 299901-gmbh_a3001000  |
| 299901-gmbh_d6197000  |
| 299901-gmbh_d7412000  |
| 299901-gmbh_d6040000  |
| 299901-gmbh_d6052000  |
| 299901-gmbh_d7400400  |
| 299901-gmbh_d6630000  |
| 299901-gpauk_k01151   |
| 299901-gmbh_d6199000  |
| 299901-gpauk_k00098   |
| 299901-gmbh_d6309000  |
| 299901-gpauk_k00358   |
| 299901-gmbh_d6357000  |
| 299901-gpauk_k08002   |
| 299901-gpauk_k01366   |
| 299901-gmbh_d7348000  |
| 299901-gmbh_d6182000  |
| 299901-gmbh_d6833000  |
| 299901-gmbh_d6416000  |
| 299901-gpauk_k01621   |
| 299901-gpauk_k01170   |
| 299901-gpauk_k01020   |
| 299901-gpauk_k01036   |
| 299901-gpauk_k01483   |
| 299901-gpauk_k01353   |
| 299901-gpauk_k00459   |
| 299901-gpauk_k01488   |
| 299901-gpauk_k01079   |
| 299901-gpauk_k00423   |
| 299901-gpauk_k00618   |
| 299901-gpauk_k01634   |
| 299901-gmbh_n6199000  |
| 299901-gmbh_n2261000  |
| 299901-gpauk_k04923   |
| 299901-gpauk_k04925   |
| 299901-gpauk_k01693   |
| 299901-gpauk_k01364   |
| 299901-gpauk_k01561   |
| 299901-gpauk_k01800   |
| 299901-gmbh_n3643000  |
| 299901-gmbh_n3013002  |
| 299901-gmbh_d7174000  |
| 299901-gmbh_a4071000  |
| 299901-gmbh_d7294000  |
| 299901-gmbh_d7090000  |
| 299901-gmbh_n3761000  |
| 299901-gmbh_d9100000  |
| 299901-gmbh_a4098000  |
| 299901-gmbh_d7243000  |
| 299901-gmbh_n2851000  |
| 299901-gmbh_d7343000  |
| 299901-gpauk_b055541  |
| 299901-gpauk_b055544  |
| 299901-gpauk_f007255  |
| 299901-gpauk_e01800   |
| 299901-gpauk_f007038  |
| 299901-gpauk_f006509  |
| 299901-gpauk_f007202  |
| 299901-gpauk_f01560   |
| 299901-gmbh_c4329000  |
| 299901-gmbh_p5016000  |
| 299901-gpauk_f007237  |
| 299901-gmbh_p5056000  |
| 299901-gmbh_p5243000  |
| 299901-gmbh_p5238000  |
| 299901-gpauk_b055556  |
| 299901-gpauk_f007257  |
| 299901-gmbh_c4335000  |
| 299901-gpauk_b055530  |
| 299901-gpauk_f006506  |
| 299901-gmbh_c4333001  |
| 299901-gmbh_c5055000  |
| 299901-gpai_nrglobi   |
| 299901-gpai_nracap    |
| 299901-gpai_nrpkdigi  |
| 299901-gpai_nrtift    |
| 299901-gpai_nrbircom  |
| 299901-gpai_nrextrem  |
| 299901-gpai_nrtech    |
| 299901-gpauk_s000039  |
| 299901-gpauk_b055549  |
| 299901-gpauk_s000029  |
| 299901-gpauk_s000005  |
| 299901-gmbh_c4713000  |
| 299901-gpauk_f007250  |
| 299901-gmbh_d7066000  |
| 299901-gmbh_p5033001  |
| 299901-gpauk_f007002  |
| 299901-gpauk_k01591   |
| 299901-gpauk_k01270   |
| 299901-gpauk_k01178   |