The cars were made available via a leasing program, with the option to purchase the cars specifically disallowed by a contractual clause (the suggested retail price was quoted as $34,000).

There were also issues about solicitors not properly explaining the long-term implications of complex contractual clauses in house-buying deals.

And he plans to insert a number of contractual clauses which will prevent the next man from walking out as soon as he gets a more lucrative offer.

Several formal languages have been developed or proposed for specifying contractual clauses.

Smart contracts usually also have a user interface and often emulate the logic of contractual clauses.