echo
----
+-------+------------+------------+--------------------+-----------------------------------+
| SPAN  |  KEY HEX   | ENDKEY HEX |    VERSION HEX     |              PRETTY               |
+-------+------------+------------+--------------------+-----------------------------------+
| {a-b} | 61         | 62         | 000000000000000109 | {a-b}/0.000000001,0               |
| {a-b} | 61         |            | 0000000000000001   | "a"/0.000000001,0                 |
| {a-b} | 61ffffffff |            | 0000000000000001   | "a\xff\xff\xff\xff"/0.000000001,0 |
+-------+------------+------------+--------------------+-----------------------------------+
