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Core Words Familarize yourself with the 'core words'.
Compounds Expand your vocabulary by studying more complex words built by the 'core words'.
Etymology Explore the origin of the 'core words'.

{n}	house of cards	(structure made by laying cards perpendicularly on top of each other)	Kartenhaus {n}
{n}	house of cards	(structure or argument built on a shaky foundation)	Kartenhaus {n}