jednmu fu'ivla

x1 (event/state) is on Friday or the fifth day of a week x2 in system x3.

lo jednmu = lo se jefydeidetri be li mu. See also detri, detke'u, jeftu; jednpa, jednre, jednci, jednvo, jednmu, jednxa, jednze.

In notes:

mumdei
x1 is a Friday of week x2 in calendar x3.
jedlno
x1 (event/state) is on Sunday or the zeroth day of a week x2 in system x3.
jedlre
x1 (event/state) is on Tuesday or the second day of a week x2 in system x3.
jednci
x1 (event/state) is on Wednesday or the third day of a week x2 in system x3.
jednpa
x1 (event/state) is on Monday or the first day of a week x2 in system x3.
jednre
x1 (event/state) is on Tuesday or the second day of a week x2 in system x3.
jednvo
x1 (event/state) is on Thursday or the fourth day of a week x2 in system x3.
jednxa
x1 (event/state) is on Saturday or the sixth day of a week x2 in system x3.
jednze
x1 (event/state) is on Sunday or the seventh day of a week x2 in system x3.