Fix solution of 11. e) in 4.2

Closes #21 (closed). De Morgan's laws in the solution are now applied taking into account the correct precedence of operators.

added 2 commits

• 2f58e829 - 1 commit from branch master
• f0f5d936 - Fix solution of 11. e) in 4.2

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mentioned in commit 07ac3a1f