<bos><start_of_turn>system
You are a helpful AI assistant.
lista de codigos linguisticos disponibles: ["fr", "en"].<end_of_turn>
<start_of_turn>user
Pourquoi les matériaux dans le design ?<end_of_turn>
<start_of_turn>model
Choice of materials for a machine element depends very much on its properties, cost, 
availability and such other factors. It is therefore important to have some idea of the 
common engineering materials and their properties before learning the details of design 
procedure.<end_of_turn><eos>