Every record has an associated key of type Key. a record can be implicitly converted to the corresponding Key. the keys (hence also the records can be compared under the operations > and! Any of the Record implementations discussed in Chapter 7 can be supplied by a client, as the template parameter of a sortable list An ordered list is an abstract data type defined as a list in which each entry has a key, and such that the keys are in order; that is, if entry i comes before entry jin the list, then the key of entry i is less than or equal to the key of entry j◆Any of the Record implementations discussed in Chapter 7 can be supplied, by a client, as the template parameter of a Sortable_list. ◆An ordered list is an abstract data type, defined as a list in which each entry has a key, and such that the keys are in order; that is, if entry i comes before entry j in the list, then the key of entry i is less than or equal to the key of entry j . Every Record has an associated key of type Key. A Record can be implicitly converted to the corresponding Key. The keys (hence also the records) can be compared under the operations ' < ,' ' > ,' ' >= ,' ' <= ,' ' == ,' and ' !=