Monograms that appear only on a single type, with some optional authority/mint context

singleton_monograms.sparql

PREFIX crm:  <http://www.cidoc-crm.org/cidoc-crm/>
PREFIX dcterms:  <http://purl.org/dc/terms/>
PREFIX dcmitype:  <http://purl.org/dc/dcmitype/>
PREFIX foaf:  <http://xmlns.com/foaf/0.1/>
PREFIX geo:  <http://www.w3.org/2003/01/geo/wgs84_pos#>
PREFIX nm:  <http://nomisma.org/id/>
PREFIX nmo:  <http://nomisma.org/ontology#>
PREFIX org:  <http://www.w3.org/ns/org#>
PREFIX rdf:  <http://www.w3.org/1999/02/22-rdf-syntax-ns#>
PREFIX rdfs:  <http://www.w3.org/2000/01/rdf-schema#>
PREFIX skos:  <http://www.w3.org/2004/02/skos/core#>
PREFIX xsd:  <http://www.w3.org/2001/XMLSchema#>

SELECT ?symbol ?mint ?authority ?svg (count(?type) as ?count) WHERE {
  ?type a nmo:TypeSeriesItem ;
          dcterms:source ?source ;
          nmo:hasObverse/nmo:hasControlmark|nmo:hasReverse/nmo:hasControlmark ?symbol .
  OPTIONAL {?type nmo:hasMint ?mint}
  OPTIONAL {?type nmo:hasAuthority ?authority}
  ?symbol crm:P165i_is_incorporated_in ?svg .
  ?source dcterms:isPartOf nm:greek_numismatics .  
} GROUP BY ?symbol ?mint ?authority ?svg HAVING (?count = 1) LIMIT 100