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Richard, it's 'swapping'.
Some love to use the 'Guess' chalk for their whiteboards.
Pirelli are to blame, it is their tyres rubber that is the problem, it is their compound that is the problem.
Cuts anywhere in the carcass certainly DO cause sudden tyre delamination, evidence in point is the 2013BritishGP. Even if there is a small amount of contaminant/debris on the inside of the tyre, at the speeds they go in F1, it is enough to blow it to kingdom-come. A big question is, where did the cuts come from? Scaring to the carcass? Most likely. Its not like this is new to Formula1 though.