If someone bends down on one knee and asks for marraige, or asks for the allowance to kiss you, then the following should be said.
"YES"
"you can"
"you may"
I hope that this helped, If I have it all wrong my apologies.
The answer: 3, 2 ,1, 4.
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Start with: 3) plaque; then, 2) enamel decay; then, 1) dentin decay;
then, 4) pulp decay.
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