if the conjugation adds an 'a' or an 'o' to the stem, then the 'g' is changed to 'j'

if the conjugation adds an 'a' or an 'o' to the stem, then the 'g' is changed to 'j'

escoger - to choose
acoger - to welcome, take in, receive
coger - to take
emerger - to emerge
encoger - to shrink
recoger - to pick up
sobrecoger - to frighten, to startle
sumergir - to submerge, plunge, dip
afligir - to afflict, to distress
divergir - to diverge
erigir - to erect, to build
exigir - to demand, to call for
infligir - to inflict, to impose
refulgir - to shine brightly
restringir - to limit, to restrict
rugir - to growl
surgir - to spring forth, to appear