libphonenumber/resources/metadata/358/altformats.csv

1	Format	Parent Format	Comment
2	X XXX XXX*	fmt_1/4-9	Alternative format for one-digit prefix mid-length numbers.
3	XX XXX XXX*	fmt_2/4-8	Alternative format for two-digit prefix mid-length numbers.
4	X XXXX XXX	fmt_1/4-9	Alternative format for one-digit prefix mid-length numbers.