Below is a list of potential QWERTY keyboard 'typos' (typing mistakes) for the phrase 'tello', from the free online typo generator. Enter another phrase to see possible typing errors, or select from one of the "top typos" charts.
Original
tello
Transposition0
etllo
tlelo
telol
Transposition1
letlo
tlleo
teoll
Transposition2
lelto
tolle
Transposition2r
lleto
tolle
Transposition0x2
etllo
etlol
tleol
Slip3A
eltlo
tlleo
telol
Slip3B
ltelo
tlelo
teoll
Omission
ello
tllo
telo
tell
Repetition
ttello
teello
telllo
telloo
QWERTY Substitution
rello
yello
twllo
trllo
teklo
telko
telli
tellp
QWERTY Repetition after
trello
tyello
tewllo
terllo
telklo
tellko
telloi
tellop
QWERTY Repetition before
rtello
ytello
twello
trello
tekllo
telklo
tellio
tellpo
QWERTY Substitution Transposed
erllo
rlelo
relol
eyllo
ylelo
yelol
wtllo
tlwlo
twlol
rtllo
tlrlo
trlol
etklo
tkelo
telko
tekol
etlko
tleko
teklo
telok
etlli
tleli
telil
etllp
tlelp
telpl
WrongDoubles
teelo
teloo
$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
$stringify
$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