BNF

<Base>:=Base: <name> at (<latitude>,<longitude>)
<Target>:=Target: <name> at (<latitude>,<longitude>)
<Site>:= <Base>|<Target>
<SiteList>:=<Site><nl><SiteList>|<Site><nl>
<SiteDoesNotExist>:=Error: The specified site does not exist.<nl>
<UnableToDeleteSite>:=Error: The Site cannot be deleted because it has been mapped.<nl>
<NoSitesEntered>:=No sites have been entered into the dictionary.<nl>
<SiteNotMapped>:=Error: The <Site> has not been mapped.<nl>
<SiteAlreadyMapped>:=Error: The <Site> has already been mapped.<nl>
<SiteAlreadyExists>:=Error: The specified <Site>, already exists.<nl>

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