How many {encodes} are to/by {DL-proline} ?
How many encodes are by DL-proline?
SELECT (COUNT(?sub) AS ?value ) { ?sub wdt:P688 wd:Q484583 }
SELECT (COUNT(?sub) AS ?subs ) {
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> ?sub .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P688> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> http://wikidata.dbpedia.org/resource/Q484583 .
} 

The number of encodes by DL-proline is?