Draft the following contracts:

1. Contract of sale

2. Contract of loan

3. Contract of lease

Ps: Each aforementioned contract document must be compliant with the provisions of the Civil Code of the Philippines, and the context of each document should also be in the Philippines. After each contract, explain the legality/validity of a said contract. Cite and explain as well the three (3) essential elements of a contract in each of the 3 contract.