X_OPERAND_TYPE is a fixed lexicon with the following values:
Saved
Value
Displayed Value
$C $C
$F $F
$G $G
$L $L
$P $P
$S $S
$V $V
A A
AC AC
B B
CE CE
CF CF
CH CH
CL CL
D D
DB DB
DV DV
EC EC
EF EF
EM EM
EP EP
EQ EQ
ET ET
EY EY
FT FT
N N
NV NV
OV OV
PC PC
PF PF
PM PM
PN PN
PP PP
PQ PQ
PT PT
PY PY
RT RT
S S
SN SN
UC UC
UF UF
V V
WB WB