After “short” vowels in word middles.
badger
bludger
bludging
budgerigar
budget
codger
cudgel
dodgy
edges
edging
edgy
fidget
fledgling
gadget
grudging
ledger
lodger
midget
Mudgee
Murrumbidgee
Pidgin
pledging
podgy
sledging
smidgin
stodgy
wedgie
Wedgwood
widget