Task: Error-Detect (source dataset: Spreadsheet-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:
| map unit symbol (national symbol)   |
|:------------------------------------|
| c2a (2q0rr)                         |
| c3a (2pwf7)                         |
| c5a (2q539)                         |
| c21a (2q3bt)                        |
| c53a (2qyg6)                        |
| c73a (2q2kv)                        |
| c132b (2w42d)                       |
| c132c (2w42j)                       |
| c135c (2w42f)                       |
| c135d (2q52k)                       |
| c148c (2q2jf)                       |
| c155f (2q3bg)                       |
| c156f (2q3bd)                       |
| c161c (2rrq5)                       |
| c162f (2q52g)                       |
| c165f (2q3b9)                       |
| c172d (2qyfw)                       |
| c175d (2w42g)                       |
| c176e (2w42h)                       |
| c177d (2w42m)                       |
| c201a (2q3b7)                       |
| c210a (2q3bl)                       |
| c210b (2q3bk)                       |
| c275a (2q4w4)                       |
| c276a (2q4w6)                       |
| c400a (2q4wv)                       |
| c406a (2q52j)                       |
| c406b (2q4x7)                       |
| c411a (2q4wq)                       |
| c412a (2q52x)                       |
| c419a (2q3bn)                       |
| c447a (2q73g)                       |
| c486b (2q52r)                       |
| c491a (2q3bx)                       |
| c584a (2q4w9)                       |
| c667a (2q2jn)                       |
| c667b (2q2jm)                       |
| c772b (2q2jj)                       |
| c800b (2q3gf)                       |
| c819b (2q3gq)                       |
| c825a (2q2hs)                       |
| c829a (2pwf6)                       |
| c853b (2q534)                       |
| c870e (2q737)                       |
| c874b (2q3h4)                       |
| c874c (2q3h5)                       |
| c877b (2q39t)                       |
| c893c (2q6ln)                       |
| c990f (2q3c2)                       |
| c996 (2q58t)                        |
| g2a (2q3tp)                         |
| g3a (2q3tq)                         |
| g4a (2q3tr)                         |
| g6a (2q3ts)                         |
| g25a (2q3tv)                        |
| g29a (2q4hs)                        |
| g32a (2q50g)                        |
| g33a (2q4ht)                        |
| g37a (2q4nj)                        |
| g38a (2q3v2)                        |
| g43a (2q3v3)                        |
| g44a (2q3v4)                        |
| g48a (2q3v5)                        |
| g52a (2q3v7)                        |
| g53a (2q3v9)                        |
| g54a (2q3vb)                        |
| g55a (2q3vc)                        |
| g70a (2q3vg)                        |
| g73a (2q4nq)                        |
| g100a (2q3vh)                       |
| g101a (2q3vj)                       |
| g112a (2q3vk)                       |
| g118a (2q3vn)                       |
| g120a (2q3vq)                       |
| g122a (2q3vr)                       |
| g122b (2pwzb)                       |
| g123a (2q61d)                       |
| g123b (2q61f)                       |
| g124a (2pwzd)                       |
| g124b (2q4ns)                       |
| g128a (2pwzg)                       |
| g129a (2q4nt)                       |
| g137a (2pwz9)                       |
| g138a (2q4nw)                       |
| g142a (2pwz8)                       |
| g143a (2pwz7)                       |
| g143b (2pwz6)                       |
| g143c (2pwz5)                       |
| g143d (2pwz4)                       |
| g143f (2pwz3)                       |
| g144b (2pwz2)                       |
| g146b (2pwyz)                       |
| g147c (2pwyw)                       |
| g147d (2pwyv)                       |
| g147f (2pwyt)                       |
| g148c (2q61g)                       |
| g148d (2q61h)                       |
| g193b (2pwzn)                       |
| g250a (2q4jh)                       |
| g251a (2q4jj)                       |
| g254a (2q4jm)                       |
| g269a (2q4jw)                       |
| g270a (2q4jy)                       |
| g272b (2q4jz)                       |
| g272c (2q4k0)                       |
| g272e (2q4k1)                       |
| g273a (2q4k2)                       |
| g273b (2q4k3)                       |
| g275a (2q4k4)                       |
| g276a (2q4k5)                       |
| g276b (2q4z3)                       |
| g282a (2q4z5)                       |
| g288a (2q4z6)                       |
| g300a (2q4z7)                       |
| g302a (2q4z9)                       |
| g304a (2q4zc)                       |
| g304b (2q619)                       |
| g304c (2q4zf)                       |
| g304e (2q4zg)                       |
| g308a (2q4zj)                       |
| g309a (2q4zk)                       |
| g312b (2q4zl)                       |
| g323a (2q4zs)                       |
| g329a (2q4zx)                       |
| g332a (2q500)                       |
| g335a (2q503)                       |
| g337b (2q504)                       |
| g339a (2q506)                       |
| g347a (2q50b)                       |
| g350a (2q50c)                       |
| g355a (2q50j)                       |
| g358a (2q50m)                       |
| g361a (2q50p)                       |
| g362a (2q5bd)                       |
| g363a (2q5bf)                       |
| g366a (2q5bj)                       |
| g369a (2q5bl)                       |
| g371b (2sd2x)                       |
| g372a (2q5bn)                       |
| g372b (2q61q)                       |
| g373b (2sd2y)                       |
| g376a (2q5bq)                       |
| g377b (2q5bs)                       |
| g381b (2q5bx)                       |
| g382b (2q5by)                       |
| g383b (2q5bz)                       |
| g384b (2q5c0)                       |
| g385b (2q5c1)                       |
| g389a (2q5c4)                       |
| g425b (2q5cm)                       |
| g431a (2q5mx)                       |
| g447a (2q5n4)                       |
| g453a (2q5n5)                       |
| g454a (2q5n6)                       |
| g456a (2q5n7)                       |
| g462a (2q5n9)                       |
| g463a (2q5nb)                       |
| g465a (2q5nc)                       |
| g480a (2q5nl)                       |
| g485a (2q5nq)                       |
| g486b (2q5ns)                       |
| g516a (2q5p7)                       |
| g520a (2q5p8)                       |
| g521a (2q5p9)                       |
| g523a (2q5pc)                       |
| g530a (2q5pf)                       |
| g546a (2q5pg)                       |
| g547a (2q5ph)                       |
| g548a (2q5pj)                       |
| g551a (2q5pk)                       |
| g554a (2q5pm)                       |
| g561a (2q5rb)                       |
| g562a (2q5rc)                       |
| g584a (2q5rs)                       |
| g584b (2q5rt)                       |
| g596a (2q5s0)                       |
| g596b (2q5s1)                       |
| g596c (2q5s2)                       |
| g612c (2q5sf)                       |
| g650 (2q5vp)                        |
| g651e (2q5vq)                       |
| g680c (2q5w3)                       |
| g681c (2q5w7)                       |
| g711a (2q5wj)                       |
| g729a (2q5wn)                       |
| g731a (2q5wp)                       |
| g732a (2q5wq)                       |
| g732b (2q5wr)                       |
| g735a (2q5wt)                       |
| g741a (2q5x1)                       |
| g779a (2q60n)                       |
| g996 (2q616)                        |
| g997 (2q617)                        |