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'sequential' means 'one after another' - first do task A, then do task B, then do task C...

'concurrent' means 'at the same time' - do tasks A, B and C all at once.

In a relay race, a team runs sequentially - each team member runs, then passes the baton to the next so that s/he can tun - but all the teams run concurrently - all the teams have someone running at any given time in the race.

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