selyle'u lujvo

l2 is an alphabet/character set containing letter l1 representing l3.

In notes:

abgida
x1 is an abugida used to write x2.
alfabeta
x1 is an alphabet used to write x2.
selylerterganzu
x1 is an alphabetical order of writing system x2=l2 organised by x3 based on system x4.