Four letter Word Game

Post

pest

lest

leat

lent

lint

Lino

Lido

lids

sild

Slid

Said

maid

maim

Mail

mall

malt

melt

Meat

neat

nest

pest

peso

esox

oxen

oven

over

rove

dove

hove

love

vole

vale

veal

lave

nave

maze

mane

mare

Sorry for interrupting but as I have only recently joined in this thread, I was just checking the rules but didn't find them. So if it's OK for 'maze' to follow on from 'nave', what is the rule about changing more than 1 letter?