tech/track/tack
tech
bend/band/gang
bend
fad/fat/fed
fed
sad / bag / salt / tap
salt
back/beck/peck
back
sat/set/sad
set
said/sad/sat
said
man/can/ken
ken
head/sled/had
had
axe/ex/egg
axe
flash/splash/flesh
flesh
pan/pen/penny
pan
dad/dead/ted
dad
end/and/egg
and
mat/met/mad
met
pat/can/pet
pet