Avoid informal usage of 'you'

doc/ego/cf/cf4

@@ -15,8 +15,8 @@ that can reach B without going through C.
 .PP
 As an example of how the algorithm works,
 consider the piece of program of Fig. 4.1.
-First just look at the program and think for
-yourself what part of the code constitutes the loop.
+First just look at the program and try to
+see what part of the code constitutes the loop.
 .DS
 loop
    if cond then                       1

doc/ego/cs/cs4

@@ -133,7 +133,7 @@ l l.
 .DE
 In this way an item on the fake-stack always contains
 the necessary information.
-As you see, EM expressions are parsed bottum up.
+EM expressions are parsed bottum up.
 .NH 3
 Updating entities
 .PP