sols = [
    '''
        MATCH (region:Region)-[:IS_LOCATED_IN]-(continent:Continent)
        RETURN region.name, continent.name
    ''', 
    '''
        MATCH (region:Region)-[:HAS_ISOLATED]-(azone:AvailabilityZone)
        RETURN region.name,azone.name
    ''', 
    '''
        MATCH(e:EC2InstanceType)
        return e.family, count(*)
    ''',
    '''
        MATCH(e:EC2InstanceType)--(p:Price)
        with e, p.cost_per_hour/e.memory as price_per_GB
        Order by price_per_GB
        Return e.name, price_per_GB
        Limit 1
    ''',
    '''
        match (service:Service)-[:OFFERS_SERVICE]-(region:Region) 
        with service, count(region) as number_of_region, collect(region.name) as region_name_collection
        where number_of_region > 5
        return service.name, number_of_region,region_name_collection
        order by number_of_region desc, service.name asc
    ''',
    '''
        match (instance:EC2InstanceType)--(price:Price)--(region:Region {name: "N. Virginia"})
        where price.cost_per_hour > 1
        return instance.name, price.cost_per_hour, region.name
    ''',
    '''
        match(a:Service)--(:Region)--(c:Continent)
        with a, count(distinct c) as number_of_continent
        where number_of_continent = 5
        return a.name, number_of_continent
    ''', 
    '''
        match (r:Region)-[:OFFERS_SERVICE]->(s1:Service {name:'AWS Data Pipeline'}), (r)-[:OFFERS_SERVICE]->(s2:Service {name:'Amazon Kinesis'})
        return r.name
    ''', 
    '''
        match (r:Region)-[:OFFERS_SERVICE]->(s1:Service {name:'Amazon Simple Email Service'})
        WHERE NOT (r)-[:OFFERS_SERVICE]->(:Service {name:'AWS Data Pipeline'})
        return r.name
    ''', 
    '''
        match(a:Service)<-[]-(e:EC2InstanceType {name: 'Â i2.2xlarge'})
        where NOT (a)<-[]-(:EC2InstanceType {name: 'c3.2xlarge'})
        return a.name, 'offered only on i2.2xlarge' as description
        union
        match(a:Service)<-[]-(e:EC2InstanceType {name: 'Â i2.2xlarge'})
        where (a)<-[]-(:EC2InstanceType {name: 'c3.2xlarge'})
        return a.name, 'offered on i2.2xlarge and c3.2xlarge' as description
    '''
]