The SHA256 checksums are as follows:
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boost_1_78_0_b1_rc1.tar.bz2
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boost_1_78_0_b1_rc1.tar.gz
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boost_1_78_0_b1_rc1.7z
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boost_1_78_0_b1_rc1.zip
As always, the release managers would appreciate it if you download the
candidate of your choice and give building it a try. Please report both
success and failure, and anything else that is noteworthy.