why is not J used in nameing of variable stars?



R S T U V W X Y Z
RR RS RT RU RV RW RX RY RZ
SS ..................SZ
TT................TZ
..................
.........
...............
ZZ
AA AB...AI (NOT AJ) AK....AZ
BB....BI (NOT BJ) BK....BZ
......................
...................
.............
II (NOT IJ) IK.................IZ
NOT JJ NOT JK .................NOT JZ
KK KL...................KZ
LL...................LZ
.................
...................
QQ QR QS QT QU QV QW QX QY QZ

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