Below is a list of potential QWERTY keyboard 'typos' (typing mistakes) for the phrase 'gas', from the free online typo generator. Enter another phrase to see possible typing errors, or select from one of the "top typos" charts.
Original
gas
Transposition0
ags
gsa
Transposition1
sag
Transposition2
Transposition2r
Transposition0x2
Slip3A
asg
Slip3B
sga
Omission
as
gs
ga
Repetition
ggas
gaas
gass
QWERTY Substitution
fas
has
gss
gaa
gad
QWERTY Repetition after
gfas
ghas
gass
gasa
gasd
QWERTY Repetition before
fgas
hgas
gsas
gaas
gads
QWERTY Substitution Transposed
afs
fsa
ahs
hsa
sgs
aga
agd
gda
WrongDoubles
$JSON
$address
$applyDefault
$clone
$commas
$copy
$copyFields
$delete
$entries
$expand
$filt
$getType
$isArray
$isBoolean
$isClass
$isDate
$isElement
$isFunction
$isNumber
$isObject
$isString
$isType
$isValidDate
$json2txt
$keys
$load
$matchall
$parseFloats
$pick
$postJSON
$prune
$save
$set
$sortBy
$sortKeys
$stringify
$stringifySafe
$sum
$svgPoster1
$table
$textify
$toFixed
$type
$without
Glossary
Transposition = adjacent pairs of letters are swapped
Omission = individual letters are missed out
Repetition = individual letters are entered twice consecutively
QWERTY substitution = letters are replaced by each of their QWERTY-keyboard based physical neighbours (e.g. 'h' gets replaced with y, u, j, n, b, g)
QWERTY repetition type 1 = letters are followed by each of their QWERTY-keyboard neighbours
QWERTY repetition type 2 = letters are preceded by each of their QWERTY-keyboard neighbours