komplekt

/komplekt/

Cases

SingularPluralWhen to use it
nominativekomplektthe setkomplektlethe setsthe plain dictionary form — the doer of the sentence
genitivekomplektnithe set'skomplektlenithe sets'the owner — whose it is
accusativekomplektnithe set (as the object)komplektlenithe sets (as the object)a specific, known object — whom or what
dativekomplektgeto the setkomplektlegeto the setsdirection or recipient — to where, to whom
locativekomplektdeat / in the setkomplektledeat / in the setswhere it is; also having — mende bar, "I have it"
ablativekomplektdenfrom the setkomplektledenfrom the setswhere it comes from; also "than" when comparing
When to use each case
nominative
the plain dictionary form — the doer of the sentence
genitive
the owner — whose it is
accusative
a specific, known object — whom or what
dative
direction or recipient — to where, to whom
locative
where it is; also having — mende bar, "I have it"
ablative
where it comes from; also "than" when comparing

The endings are the same ones the pronouns wear — that page explains when each case is used.

With an owner

One ownedSeveral owned
mykomplektimmy setkomplektlerimmy sets
yourkomplektingyour setkomplektleringyour sets
his / herkomplektihis / her setkomplektlerihis / her sets
ourkomplektibizour setkomplektleribizour sets
you all'skomplektigizyou all's setkomplektlerigizyou all's sets
theirkomplektleritheir setkomplektleritheir sets

The overlap in the last rows is real, not a mistake: komplektleri can mean "his / her sets", "their set", or "their sets" — context decides.