1  2  3  4 

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ACROSS
1)  a male monarch or emperor (especially of russia prior to 1917)
2)  (trademark) a child's plastic construction set for making mechanical models
3)  (physics and chemistry) the smallest component of an element having the chemical properties of the element
4)  something that remunerates


DOWN
1)  sharp curved horny process on the toe of a bird or some mammals or reptiles
2)  the 6th letter of the greek alphabet
3)  highly excited
4)  capital and largest city of italy; on the tiber; seat of the roman catholic church; formerly the capital of the roman republic and the roman empire

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czar
lego
atom
wage