assimilation "ths", deletion of /t/ and /d/

cloths -- clos
months -- munts



windmill -- winmill
christmas -- chrismas
landmine -- lanmine

mostly -- mosly
plenty -- pleny
soften -- sofen
moisten -- moisen
mustn't -- musn't
often -- ofen (often wud do)



no /t/ deletion:
warranty
piston



/d/ to /b/

i'd been -- i'b been
good bye -- goob bye