Part two implementation#6

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oleksiipet wants to merge 4 commits intohyperskill:masterfrom

oleksiipet:part-two

Commits on Nov 24, 2018

First phase implementation done
opetenko
committed

Commits on Nov 26, 2018

Second phase implementation done
opetenko
committed

Commits on Dec 2, 2018

Second phase implementation done
opetenko
committed

Commits on Dec 15, 2018

Second phase implementation done
opetenko
committed