Revert "Merge conflict in server.tex"

This reverts commit b3e6ca69d9e4c857f43085b97bc38ddc3f248ab5.
Revert "Update concepts.tex"

This reverts commit 895c988dcb2df89f9a749d903719dac6fa0ff94c.
Revert "Revert "Update concepts.tex""

This reverts commit 186f418d39dd4bdaffea839c9228774464aec7c4.