Question: Which has the smallest mains voltage among the democracies with government containing the presidential system?
Choices: Namibia
Bolivia
Zimbabwe
Mozambique
Italy
Colombia
Tunisia
Zambia
Belarus
Germany
SPARQL: SELECT ?e WHERE { ?e <pred:instance_of> ?c . ?c <pred:name> "democracy" . ?e <basic_form_of_government> ?e_1 . ?e_1 <pred:name> "presidential system" .  ?e <mains_voltage> ?pv . ?pv <pred:value> ?v .  } ORDER BY ?v LIMIT 1
Program:
function: Find
inputs: presidential system
function: Relate
dependencies: 0
inputs: basic form of government
backward
function: FilterConcept
dependencies: 1
inputs: democracy
function: SelectAmong
dependencies: 2
inputs: mains voltage
smallest
Answer: Belarus