In prolog, define the prefix predicate so that prefix(x, y) says that x is a list that is a prefix of y. that is, each element of x is equal to (unifies with) the corresponding element of y, but y may contain additional elements after tha. check that your predicate works when x is uninstantiated: given a query like prefix(x, [1,2,3]), it should find all the prefixes of the list [1,2,3].

You are almost finished updating a web site. as part of the update, you have converted all pages from html 4.0 to html5. the project is currently on schedule. however, your project manager has been asked by the marketing team manager to justify a day of time spent validating the site's html5 pages. the marketing team manager does not have technical knowledge of the internet or the web. which is the most appropriate explanation to provide to the marketing team manager?

Dean wants a quick way to look up staff members by their staff id. in cell q3, nest the existing vlookup function in an iferror function. if the vlookup function returns an error result, the text “invalid staff id” should be displayed by the formula. (hint: you can test that this formula is working by changing the value in cell q2 to 0, but remember to set the value of cell q2 back to 1036 when the testing is complete.)

All of the following are characteristics that must be contained in any knowledge representation scheme except