Contribution #1730

Problem: en/4.2.7

Added Luis's English solutions of 4.2.6, 4.2.7 and 4.2.14

Editor: Luis Daniel Fernández Quintana ( @Luisito )

Time: June 28, 2024 at 04:15 PM

GitHub commit: 615ef78a5d014b68d086f23b6f84747ca133dfe5

+99 -9 lines changed