S1: At four O’clock this morning, Hitler attacked and invaded Russia.

S6: Under its cloak of false confidence, the German armies drew up in immense strength along a line which stretches from the White Sea to the Black Sea.

P: No complaint had been made by Germany of its non-fulfilment.

Q: All his usual formalities of perfidy were observed with scrupulous technique.

R: No one could have expected that Hitler would do it.

S: A non-aggression treaty had been solemnly signed and was in force between the two countries.

The correct sequence should be

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