It gives us a lot of flexibility to deal with a lot of real world problems that come up with live events.

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The NUT said it was a matter of "very real concern" that six in 10 teachers had not received any training helping them to deal with behaviour problems.

BBC: Lessons 'tougher for male staff'

The real problems, he says, are a shortage of storage capacity and the refineries' inability to deal with big volumes.

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