Ng, double consonants and consonant clusters

When two identical consonants stand side by side, the word is called a word with a double consonant. In native Uzbek words both parts of the double consonant are clearly heard and written: katta (big), achchiq (bitter), to‘qqiz (nine). In some borrowed words the double consonant is said like a single one but written double: kassa (cash desk), tennis. In words like kilogramm, kristall one of the final double consonants is hardly heard, but it is kept in writing. When a suffix beginning with the same consonant is added to such a word, three identical letters are not written in a row; one is dropped: kristall + -lar = kristallar.