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Project Euler problems 06, 20 (#1419)

* added sol3.py for problem_20

* added sol4.py for problem_06
A
Ankur Chattopadhyay committed
11e2207182829ee6b1d13c0aec326d5a123d2c9b
Parent: 906c985
Committed by Christian Clauss <cclauss@me.com> on 10/22/2019, 4:02:03 PM