Revising chance types in SystemTypes.txt

There is some coding in this text file, I will quote:

"Number of Any Chance Types := 1
Chance Type 1 Name := Standard
Chance Type 1 Number of Any Planet Sizes := 5
Chance Type 1 Any Size 1 Type := Tiny
Chance Type 1 Any Size 1 Chance := 20"

I added Number of chance types to 5
then added all the pertinant types and percentages etc.
Keep getting numerous error messeges
Can you create extra chance types?
Standard, Habitable, trinanry, Binary, young, old etc. to this file?