using IRAC method Mary is an explorer and is about to set off on a ground-breaking expedition at the Debswana mines. Rose and John , who are Mary's friends are also professional explorers themselves, they then entered into a written agreement with each other that they will each help Mary from the start to the the end of her expedition. John breaks the agreement and does not help Mary to the end of her expedition, and instead returns home early. in 250-350 words advise Mary as to whether she can sue John for breach of contract.