Given the task definition and input, reply with output. This task is about using the specified sentence and converting the sentence to Resource Description Framework (RDF) triplets of the form (subject, predicate object). The RDF triplets generated must be such that the triplets accurately capture the structure and semantics of the input sentence. The input is a sentence and the output is a list of triplets of the form [subject, predicate, object] that capture the relationships present in the sentence. When a sentence has more than 1 RDF triplet possible, the output must contain all of them.

Alpena County Regional Airport is located in the Wilson Township, Alpena County, Michigan (United States). It has a runway length of 2744 meters and an elevation of 210 metres above sea level.

[['Alpena County Regional Airport', 'LOCATION', 'Wilson Township, Alpena County, Michigan'], ['Alpena County Regional Airport', 'ELEVATION', '210'], ['Alpena County Regional Airport', 'RUNWAY_LENGTH', '2744.0'], ['Alpena County Regional Airport', 'CITY_SERVED', 'Alpena, Michigan'], ['Alpena, Michigan', 'COUNTRY', 'United States']]