Again, you would need to fall in the window of number of samples x regions of interest x barcodes x machine capacity.

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The total number of high-rise window washers in and around the city isn't clear.

WSJ: Window-Washing Robots Rise; Humans Balk

The transfer window for a number of other European leagues also closed on Thursday, including those in Scotland, France, Spain, Italy, the Netherlands and Germany.

BBC: Premier League January transfers hit ?120m