How to trigger an automation every 3 minutes at 10 seconds past the minute?

I have several automations that run every 3 minutes but I’d like to stagger them so one runs on the minute (time pattern minutes: /3), the next starts 10 seconds later, the next one 10 seconds after that. Sadly the time pattern feature doesn’t seem to have a way to specify that.

What is the easiest/best way to handle this?

Triger them every 3 minutes, like the first one and add as first step in automation delay of 10 seconds (or 20, or so, as needed).

triggers:
  - trigger: time_pattern
    minutes: "/3"
    seconds: "10"
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