"Sing Eco-Foods" ("SEF") is a company that operates a chain of eco-conscious caf outlets in Singapore. SEF wishes to source for suppliers to provide cups and cutlery made from biodegradable and environmentally-friendly materials. SEF is aware of two potential suppliers in Singapore, which are Earth Materials Co. ("EMC") and Honest-to-Goodness Products ("HTG"). SEF sent the following email to both EMC and HTG on 1st December: "Hi, we are looking for suppliers for biodegradable and environmentallyfriendly cups and cutlery. Could you let us know your product range and your prices please?" EMC replied to SEF via email on 2nd December as follows: "We have an 'Eco-brand' range of cups and cutlery sets, which are made from environmentally-friendly materials. The cups are priced at $0.20 each, while our cutlery sets (comprising a fork, a spoon and a knife) are priced at $0.50 each." SEF replied to EMC on 3rd December with the following email: "Ok, we would like to order 1000 cups and 1000 cutlery sets. Please deliver them by the end of this month." EMC provided a short reply to SEF on 4th December via email: "Ok, we will do so." On the other hand, HTG replied on 5th December to SEF's original email as follows: "We accept your offer to be your supplier. Please contact our representative to place your order." Explain whether there is a valid contract (i) between SEF and EMC, and (ii) between SEF and HTG. In your answer, you should identify and discuss the four (4) elements of a contract.