I've been hanging wallpaper for years but this pattern repeat
description has got me beat:
'[the wallpaper] comes in 52cm x 10m rolls. It has a pattern repeat of
61cm and a half drop'.

What do they mean by '61cm and a half drop'?

The single wall onto which the wallpaper is destined is 3.3m wide by
2.3m high. Experience says 4 drops per roll so two rolls should do it.
Does the repeat description alter this?

TIA

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F