contract effective. Promissory estoppel can be applied in many but not all jurisdictions when the charging party detrimentally relies on the otherwise unenforceable contract. In England and Wales, the circumstances where promissory estoppel may be used to overcome the statute are limited, and some jurisdictions deny this possibility altogether. The "main purpose rule" as it relates to guarantee or suretyship type contracts: where the promisor's promise to answer for the debt of another is made mainly for the promisor's own economic advantage, then it is a primary promise, and enforceable even without a writing. Easements by implication: easements, which are agreements that permit the use of real estate by someone who has no property interest in the land, may be created by operation of law rather than by written instrument. This may happen where, for example, a piece of land is partitioned between owners and pre-existing utilities routes or access paths that would otherwise be trespassory over one of the plots is reasonably necessary for enjoyment of the other plot. In such case, the pre-existing use must be apparent and continuous at the time of the partition for an easement to be created by implication. The implied easement constitutes an interest in land that does not require a writing to be enforceable. Worldwide Canada The Statute of Frauds recites that it was enacted for the ". . . prevention of many fraudulent practices which are commonly endeavored to be upheld by perjury . . .". The mischief arising from claimants asserting oral agreements was to be avoided by requiring that certain contracts be evidenced by "some memorandum or note thereof . . . in writing and signed by the party to be charged therewith . . .". Contracts respecting land "created by livery and seisen only or by parole" would not be enforced absent such a writing. It quickly became apparent to the common law judges that the Statute might itself become an instrument of fraud (or at least injustice) if it was strictly enforced with respect to contracts that were wholly or partly performed. The courts developed the concept of "part performance" as an exception. If a contract concerning land was partly performed, that could displace the need for a note or memorandum in writing signed by the party to be charged. It was one thing to create an exception that displaced the need for a memorandum in writing,