One edge case is when the code processing the message has not finished, but the invisibility window lapses, and another copy of the same message gets dequeued. At this point, there are two active copies of that message being processed.

not in his favoured midfield role, either but as a false No 9: the sort of role Guardiola only hands to his chosen, crystalline few: Mario Götze at Bayern Munich (less successfully), Lionel Messi at Barcelona (a little more so).

Besides these features, Rutler looks forward to a new union of religion and politics, and of theology and science, and thereby to a transformation of the pluriversity back into a university.

The second half was a less open affair, in which West Brom grew increasingly and efficiently conservative.