Yes its unique. The statements you made above won't could not be separated lateron. See the example here https://w3c.github.io/rdf-star/cg-spec/2021-02-18.html#the-seminal-example

Your embedded triple is treated like an IRI and becomes:

:start "2010";

:end "2014";

:start "2018" .

If you need to distinguish the multiple property assignments on one embedded triple use them like this:

_:a :states ;

:start "2010";

:end "2014";

:comment "first statement"

:source .

_:b :states ;

:start "2018";

:comment "another statement on same emb. triple"

:source .

see https://w3c.github.io/rdf-star/cg-spec/2021-02-18.html#occurrences-example

Best regards

RDF Triple is an actual expression that defines a way in which you can represent a relationship between objects. There are three parts to a triple: Subject, Predicate and Object (typically written in the same order). A predicate relates subject to object. I should say its unique.

Sales Aribe Jr. thank you for the reply.

My question is specific about RDF* ou RDF-Star. It is a "an extension of RDF's conceptual data model and concrete syntaxes, which provides a compact alternative to standard RDF reification. This model and its syntaxes enable the creation of concise triples that reference other triples as subject and object resources."

See more at https://w3c.github.io/rdf-star/cg-spec/editors_draft.html