Singular genitive:
1) -s or -es strong and mixed masculine and neuter,
2) -n or -en masculine and neuter,
3) without a female ending.
Singular dative:
1) without the ending in strong and mixed variety in masculine and neuter gender (sometimes ending -e, its use is usually optional)
2) -n or -en in masculine and neuter gender
3) without a female ending.
Accusative singular:
1) without ending in strong and mixed gender in male and female and neuter gender
2) -n or -en in the weak masculine variant.
Nominative, genitive, accusative plural:
Masculine:
1) -e, rarely -er, often with an override
2) no ending (but often revised) for words ending with -er, -el, en
3) -n or -en weak and mixed
4) -s for a group of nouns of foreign origin.
Feminine:
1) -n or -en weak
2) -e often with a strong grade
3) no ending and revision for Mutter, Tochter nouns.
Neuter:
1) -er, often with Umlaut
2) -e, usually unpromised
3) no ending for words ending with -er, -el, en
4) -n or -en weak and mixed
5) -s for a group of foreign nouns.
In the plural dative, add -n to the plural denominator if it ends in -e, -l, -r.