Consider the following adjusted relation schemas with primary keys in bold. All attributes are of

type string unless stated otherwise. For simplifying the construction of queries, utilize multi$-$step

and multi$-$line approaches.. Note that aggregate functions, as defined in some resources, are

not used here, as they are extensions beyond the classical Relational Model. PLEASE ONLY

USE RELATIONAL ALGEBRA ONLY. NO SQL COMMANDS ALLOWED!

Travelers$($TravelerID$,$ FirstName, LastName, TravelDocumentNumber, CountryOfOrigin$)$

Voyages$($VoyageID$,$ StartPoint, EndPoint, TakeoffTime, LandingTime, JourneyDate,

TransportID$)$

Passes$($PassID$,$ TravelerID, VoyageID, SeatingClass, Cost, AcquisitionDate$)$

Transports$($TransportID$,$ Model, Maker, SeatingCapacity$)$

Navigators$($NavigatorID$,$ FirstName, LastName, Position, ExperienceYears$)$

VoyageCrewLink$($VoyageID$,$ NavigatorID$)$

LeadTravelerLink$($VoyageID$,$ LeadID$)$

Mishaps$($MishapID$,$ VoyageID, OccurrenceDate, Spot, Summary$)$

Leads$($LeadID$,$ FullName, Seniority$)$

Enumerate navigators $($full name$)$ with less than five years of experience who have been

assigned to a voyage with LeadTravelerA $($distinct name$).$

Locate travelers who hold citizenship in either the Commonwealth or the Federation and who

traveled on a voyage from Liberty City to Queenstown on December $25.$