A 3-bit field (CMPSCDICT_UE_COMPSYMLEN) indicating the number
of characters contained in CMPSCDICT_UE_CHARS. These characters will
be placed at offset 0 in the expanded output. This field should not
have a value of 0.
EC
Expansion character. The 7-character field (CMPSCDICT_UE_CHARS)
is provided to contain the expansion characters.