You have
XLEX
absent am, late enrolment,absent pm ??

You also have
LLLE
late am, late pm, late enrolment ??

then should you not also have
XXLE
and


LLEL
??




[and perhaps also XLEL,LLEX?]


or am I missing something?

XLEX = is absent am, late enrolment, absent pm
Scrap LLLE, it should be LLEL = Late am, late enrolment, late pm (consistent with XLEX code sequence)

Scrap LLTI, it should be LTIL = late am, Transfer In, late pm (consistent with XLEX code sequence)

You're right, please add:
XLEL = Absent am, late enrolment, late pm
LLEX = Late am, late enrolment, absent pm
XTIL = absent am, Transfer In, late pm
LTIX = Late am, Transfer In, absent pm
TIX = absent pm, Transfer In ( so that the X will fall on the right triangle)
LEX = absent pm, late enrolment



THANK YOU!!! There's power outage so I might not be able to respond to any further clarifications tonight.