internal IrregularRules(SingularRules singulars, PluralRules plurals)
 {
     _singulars = singulars;
     _plurals = plurals;
 }
 internal IrregularRules(SingularRules singulars, PluralRules plurals)
 {
     _singulars = singulars;
     _plurals   = plurals;
 }