VARIATIONS:

Redundancy:

1. Once a service company swap has been made, customers are not allowed to change companies again . . . vs.
   
2. The subscribers cannot switch again to another provider . . .

Again implies that a swap has already been made.  (1) states that assumption explicitly, while (2) doesn't.

• in 14 days vs. anytime within 14 days

By default, in 14 days implies the concept of anytime.

Syntactic variation:

• cannot vs. are not allowed to

Synonomy

• within the first three months vs. for the first three months
• call quality vs. voice quality
• change vs. switch
• although vs. but
  
• companies vs. providers
  

Inverse relationship

• if problems such as poor call quality are experienced vs. if they are not satisfied with services like voice quality

OTHER ISSUES:

• we should annotate words we didn't annotate in IL1 (prepositions, aux., conjunctions, etc.) ... or will we deal with them in another way?
• alternative representations for IL2 other than dependency trees?