Complex Cron Trigger

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#1

Hi there,
Does somebody know whether it is possible to create this sort of scheduling via cron? If not, are there other ways to do it?
Wished schedule: Trigger every working day at 8pm + for the first 6 working days of a month: trigger at 7am, 11am, 4pm, 8pm.

Implementing the first part (working days at 8) is quite easy (0 0 20 ? * MON,TUE,WED,THU,FRI *), but I don’t know if its possible if cron allows the second rule with the first 6 working days combined with the first rule.

Any ideas?
Thank you