Sequencer in flow chart?

I programmed a water plant using Opto’s charts, and it worked well, but I can’t help but think a sequencer is what I need. Has anybody created some sort of sequencer code that they liked? I can’t really picture what this would look like in flow chart, I’m sure in Opto script it can be done, but I would prefer to keep it in the chart format. Apologies in advance for thinking old school on this one.