Ship Or Sheep - Unit 11: uː (boot)
Listen to the strong and weak stresses in: oOooOo a foolproof computer.
Then listen and bold the strong stresses in:
OooO waterproof boots
oOoOo a wind-proof jacket
OooOo childproof containers
oOooO an ovenproof dish
oOooO a waterproof coat
oOooO a bullet-proof vest.