kodeks

/kodeks/

Cases

SingularPluralWhen to use it
nominativekodeksthe codekodekslethe codesthe plain dictionary form — the doer of the sentence
genitivekodeksnithe code'skodekslenithe codes'the owner — whose it is
accusativekodeksnithe code (as the object)kodekslenithe codes (as the object)a specific, known object — whom or what
dativekodeksgeto the codekodekslegeto the codesdirection or recipient — to where, to whom
locativekodeksdeat / in the codekodeksledeat / in the codeswhere it is; also having — mende bar, "I have it"
ablativekodeksdenfrom the codekodeksledenfrom the codeswhere 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
mykodeksimmy codekodekslerimmy codes
yourkodeksingyour codekodeksleringyour codes
his / herkodeksihis / her codekodekslerihis / her codes
ourkodeksibizour codekodeksleribizour codes
you all'skodeksigizyou all's codekodekslerigizyou all's codes
theirkodeksleritheir codekodeksleritheir codes

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