Adds challenges 1 to 3 from Dr. John Russell#5
Open
lfpdroubi wants to merge 1 commit intofriendly:masterfrom
Open
Adds challenges 1 to 3 from Dr. John Russell#5lfpdroubi wants to merge 1 commit intofriendly:masterfrom
lfpdroubi wants to merge 1 commit intofriendly:masterfrom
