Assertion: letter | /r/HasProperty | formal
Facets:
Source sentences:
text: Letters can be formal and informal.
text: Letters can be formal and informal.
text: A Letter of Understanding (LOU) is a formal text that sums up the terms of an undertakings of a contract which may have been negotiated up to this point only in spoken form or otherwise informally.
text: Letters of credit are formal trade instruments and are used usually where the seller is unwilling to extend credit to the buyer.