When this happened, the last "|" became the content of the second to
last column.
This happened for example with the table in the Base module
## Base 64 (URL and filename safe) alphabet
...
12 | M | 29 | d | 46 | u | 63 | _
13 | N | 30 | e | 47 | v | | |
14 | O | 31 | f | 48 | w | (pad) | =
15 | P | 32 | g | 49 | x | | |
16 | Q | 33 | h | 50 | y | | |