Happy Returns.

Marriage is bilateral;
Love is returnable.
Love is bilateral;
Happiness is returnable.
Relationship is bilateral;
Affection is returnable.
Friendship is bilateral;
Trust is returnable.
Help is bilateral;
Gratitude is returnable.
Service is bilateral;
Recognition is returnable.
Respect is bilateral;
Cordiality is returnable.
Transaction is bilateral;
Patronage is returnable.
Interaction is bilateral;
Information is returnable.
Trade is bilateral;
Profit is returnable.
Investment is bilateral;
Interest is returnable.
Entertainment is bilateral;
Enjoyment is returnable.
Instruction is bilateral;
Knowledge is returnable.
Success is bilateral;
Fame is returnable.
Life is bilateral.
Experience is returnable.
                          P. Chandrasekaran.
Note:- (the other side of life is death)