Any one as any tips on how to simplify this formula

Any one as any tips on how to simplify this formula


i'm trying to devide our clients by sector based on the postal code.

Any one as any tips on how to simplify this formula because as it is the whole process takes up  to 6300 characters and zoho limits de formula field to 5000 characters.


If(Or(
Startswith(${Contacts.Mailing Zip},'H1G'),
Startswith(${Contacts.Mailing Zip},'H1P'),
Startswith(${Contacts.Mailing Zip},'H1R'),
Startswith(${Contacts.Mailing Zip},'H1H'),
Startswith(${Contacts.Mailing Zip},'H1Z'),
Startswith(${Contacts.Mailing Zip},'H1B')),'Zone 1',
If(Or(
Startswith(${Contacts.Mailing Zip},'H1M'),
Startswith(${Contacts.Mailing Zip},'H1N'),
Startswith(${Contacts.Mailing Zip},'H1V'),
Startswith(${Contacts.Mailing Zip},'H1T')),'Zone 2',
If(Or(
Startswith(${Contacts.Mailing Zip},'H2C'),
Startswith(${Contacts.Mailing Zip},'H2N'),
Startswith(${Contacts.Mailing Zip},'H2M'),
Startswith(${Contacts.Mailing Zip},'H3L')),'Zone 3',,,,,,,,,,,,,,,,,,,,,an this goes on