This is my first post to the list, I've been using mason for a few weeks 

I'm using the Sequence class but have found the steps array inflexible 
in terms of adding new Steppables during execution.

I've implemented an ExpandableSequence which uses an arrayList rather 
than an array. I was wondering if something already exists for this? I 
might use RandomSequence at some point, which would mean re-implementing 
RandomSequence to extend ExpandableSequence.



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