flex justify-content: center with last aligned to the left of its row

I am trying to make the final item of some flex items to appear to the left of its row.
I am very new to this and am trying learn flex.

I tried something like
.last-flex-item { margin-right: 0 }
but that drags the last item all the way to the left outside of its flex row (breaching the column).

I've checked flex doc and I am lost. I can think of some inelegant ways to try but I thought I would be best to ask because it really seems like this should be a simple thing to do but I can't work it out.

https://jsfiddle.net/7ep1Lztc/1/
flexflex.png
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