"ΜΟΛΩΝ ΛΑΒΕ" is the famous historical phrase from Leonidas, king of Sparta.
The phrase "ΜΟΛΩΝ ΛΑΒ" does not exist.
"λαβ" is not a word, it is the stem of the word "λαβ-έ". Another example is the word "λαβ-ή" (handle).
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Vasiliki Baskou, Instructor/Director, https://learn-greek-online.com.