resources/metadata/52/altformats.csv - external/libphonenumber - Git at Google

 Format         ; Parent Format ; Comment
 XX XX XX XX XX ; fixed_2/4/4   ; "Alternate format for two-digit area codes."
 XXX XXX XX XX  ; fixed_3/3/4
	Format ; Parent Format ; Comment
	XX XX XX XX XX ; fixed_2/4/4 ; "Alternate format for two-digit area codes."
	XXX XXX XX XX ; fixed_3/3/4