IEnumerable<dynamic> list = dyno.Select(
    projection: "?s ?o",
    where: SPARQL.Triple(s: "?s", p: "cp:boolean", o: "?o")
);

IEnumerable<dynamic> list = dyno.Select(
    prefixes: new[] { 
        SPARQL.Prefix("dc:", "http://purl.org/dc/elements/1.1/"),//prefix could be used with colon
        SPARQL.Prefix("ns", "http://example.org/ns#")//or without colon
    },
    projection: "?title ?price",
    where: SPARQL.Group(
                SPARQL.Triple("?x dc:title ?title"),
                SPARQL.Optional(
                    SPARQL.Triple("?x ns:price ?price"),
                    SPARQL.Filter("?price < 30"))
    )
);

IEnumerable<dynamic> list = dyno.Select(
     prefixes: new[] { 
         SPARQL.Prefix("foaf:", "http://xmlns.com/foaf/0.1/"),
         SPARQL.Prefix("rdf:","http://www.w3.org/1999/02/22-rdf-syntax-ns#")
     },
     projection: "?person",
     where: SPARQL.Group(
                SPARQL.Triple("?person rdf:type  foaf:Person"),
                SPARQL.Exists("?person foaf:name ?name")
     )
);

            
IEnumerable<dynamic> list = dyno.Select(
     prefixes: new[] {
         SPARQL.Prefix("dc10", "http://purl.org/dc/elements/1.0/"),
         SPARQL.Prefix("dc11", "http://purl.org/dc/elements/1.1/")
     },
     projection: "?title",
     where: SPARQL.Group(
              SPARQL.Union(left: SPARQL.Triple("?book dc10:title  ?title"), right: SPARQL.Triple("?book dc11:title  ?title"))
     )
);

IEnumerable<dynamic> list = dyno.Select(
     prefixes: new[] {
         SPARQL.Prefix("dc10", "http://purl.org/dc/elements/1.0/"),
         SPARQL.Prefix("dc11", "http://purl.org/dc/elements/1.1/")
     },
     projection: "?title ?author",
     where: SPARQL.Group(
             SPARQL.Union(
                left: SPARQL.Group(SPARQL.Triple("?book dc10:title ?title"), SPARQL.Triple("?book dc10:creator ?author")),
                right: SPARQL.Group(SPARQL.Triple("?book dc11:title ?title"), SPARQL.Triple("?book dc11:creator ?author"))
             )
     )
);

see other examples in source code unit tests.