[O] Repeat work / week days

[SabreWolfy]

I searched here and elsewhere, and then played with various diary sexp
settings, but I could not find a way to repeat an entry on work/week days
(Monday to Friday) every week. I would like a task to appear on all Mondays
to Fridays. The repeat should preferably be from Monday to Tuesday, Tuesday
to Wednesday, etc., rather than from Monday to Monday, Tuesday to Tuesday,
etc., but this is not so important.