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Problems

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4907
Transformation of String Functions: Inverse Problem
Medium
4914
UFOs
Very easy
4915
Tree
Very easy
4917
Farm 2
Very hard
4918
About Frogs
Very easy
4938
Democracy Advances
Very hard
4942
Electrons
Easy
4943
Decomposition of permutations
Very hard
4946
Uncle Scrooge's Gold
Easy
4948
Light
Hard
4951
Factory
Very hard
4952
K-inversions
Very easy
4953
Men in Black
Very hard
4954
Path
Easy
4955
Martian Plates
Very easy
4956
Bad Roads
Easy
4957
Sequence
Medium
4958
Game of Squares
Easy
4959
Ones and Zeroes
Very hard
4960
Zones on a Plane
Hard
4961
Cockroaches in the Building
Easy
4962
Game with Cards
Very easy
4963
Flower-garden Designs
Very hard
4964
Goat in the Garden 4
Very hard
4965
Interesting Number
Very easy
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