In these nouns, the spelling does not alternate between single and double letters.

The double letter serial number prefix determines what series the note is located in.

I never met anyone with three pairs of double letters in their name.

Long vowels are sometimes written with double letters, but not consistently.

It appears that after the fifth remake the letter series was begun again with double letters.

They had found two whose names were spelled with eight letters, ending in a double letter.

Special rules handle double letters and pairs falling in the same row or column.

The first single or double letters denote the area of registration.

In the Southern order, double letters are placed immediately after their single counterparts.

The double letter in the first word appeared often through the message.