Test for Spelling-Corrections

Correct: I saw the computer.

Omission of a consonant (not the first): I saw the coputer. I saw the compuer.
Omission of the first consonant: I saw the omputer.
Omission of a vowel: I saw the cmputer. I saw the compter. I saw the computr. 

Insertion of a consonant: I saw the combputer. I saw the computrer. 
Duplication of consonants: I saw the commpputter. I saw the ccomputer.
Insertion of vowels: I saw the coomputer. I saw the coaomputer.

Substitution of a consonant by a consonant: I saw the combuter.
Substitution of the first consonant: I saw the momputer. 
Substitution of a consonant by a vowel: I saw a compuaer. I saw a comauter.
Substitution of a vowel by a vowel: I saw the compoter. I saw the campiter.
Substitution of a vowel by a consonant: I saw the compkter.

Transposition of a consonant and a vowel: I saw the comupter.
Transposition of the first consonant and a vowel: I saw the ocmputer.
Transposition of two consonants: I saw the copmuter.
Transposition of two vowels: I saw the muose.

Combinations

Omission and insertion: I saw the cmputrer.
Insertion and substitution: I saw the copputrer.
Substitution and Transposition: I saw the coppuetr.