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In page Loch:

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In Welsh, what corresponds to lo is lu in Old Welsh and llw in Middle Welsh (such as in today's Welsh placenames Llanllwchaiarn, Llwchwr, Llyn Cwm Llwch, Amlwch, Maesllwch), the Goidelic lo being taken into Scottish Gaelic by the gradual replacement of much Brittonic orthography with Goidelic orthography in Scotland.[citation needed]