trip
day 1 luxury "Amsterdam" "Rotterdam" -
day 2 normal "Bonn" "Mainz" -
day 3 economy "Basel" "Zurich" -
end


/*
Trip = "trip" <dayTrips> DayTripList.
DayTripList : EDayTripList | NDayTripList.
EDayTripList = .
NDayTripList = <first> DayTrip <rest> DayTripList.
DayTrip = "day" <day> Day <kind> DTKind <locations> LocationList.
LocationList : ELocationList | NLocationList.
ELocationList = .
NLocationList = <first> Location <rest> LocationList.
DTKind : Luxury | NE.
NE : Normal | Economy .
Luxury = "luxury".
Normal = "normal".
Economy = "economy".
Location = <s> String.
Day = <n> Integer.
*/