I am working on a project that will require a brief set of wilderness survival instructions for potential use by a novice with little or no experience in the wilderness. I want to include the 4 most useful knots they might make use of. I have some ideas, but though it would be valuable to get your collective thoughts on which 4 knots you would consider absolutely essential as you improvise shelter and such in a survival situation with very limited equipment and supplies, as might be found in a very basic PSK. The best would also have the attributes of being easy to illustrate, multi-functional, idiot proof, well you get the idea. Thanks for your input.