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Alack (interjection)
An expression of sorrow or mourning.
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Alas (noun)
A type of depression which occurs in Yakutia, formed by the subsidence of permafrost.
Wiktionary
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Alack (interjection)
used to express regret or dismay.
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Alas (interjection)
used to express grief, pity, or concern
“alas, my funds have some limitations”
Oxford Dictionary