n, it is simplified (e.g. fætter, fæt_r-e "male first cousin"; seddel, sed_l-en, sed_l-er "(bank)note"). All nouns ending in unstressed -er can keep the e before the definite singular ending: fætter-en, kammer-et, orkest(e)r-et. The common-gender nouns in this group must keep it, with the sole exception of baluster, which can also be neuter: balust(e)ren/balust(e)ret. Of the nouns ending in unstressed -er that take the indefinite plural ending -e, those that keep the e of the stem before the indefinite plural ending (e.g. banner-e) lose the plural ending -e before the definite plural ending -ne (e.g. banner-_-ne) – but see kælder below. (Those that lose the e of the stem before the indefinite plural ending (e.g. ced_r-e) follow the main rule and keep the plural ending -e before the definite plural ending -ne (e.g. ced_r-e-ne).) Of the common-gender nouns ending in unstressed -er, the vast majority take the plural ending -e and keep the e of the stem in all forms: arbejder, arbejder-en, arbejder-e, arbejder-_-ne. Of the minority, those that take the plural ending -e keep the e of the stem in the definite singular form (with the sole exception mentioned above) and lose it in the plural forms: mester, mester-en, mest_r-e, mest_r-e-ne. Some inflect either like arbejder or like mester: salamander, salamander-en, salamand(e)r-e, salamander-_-ne/salamand_r-e-ne. Kælder inflects like arbejder or like mester in the indefinite plural, but only like mester in the definite plural: kælder, kælder-en, kæld(e)r-e, kæld_r-e-ne. With seven exceptions, all nouns ending in unstressed -el can lose the e before all endings: cykel, cyk_l-en, cyk_l-er, cyk_l-er-ne; engel, eng_l-en, eng_l-e, eng_l-e-ne; bibel, bib(e)l-en, bib_l-er, bib_l-er-ne; himmel, him(me)len, him_l-e, him_l-e-ne. With the seven exceptions already mentioned plus another seven, all nouns in this group must lose the e before the plural endings. The word pixel can't lose the e before the plural ending -s, but must lose it before the plural ending -er: pix(e)l-en, pixel-s/pix_l-er, pix_l-er(-)ne. All nouns ending in unstressed -en can keep the e before all endings. It is common for nouns to change during inflection in ways that aren't reflected in spelling. They can lose stød (e.g. hus , huset , huse ), add stød, or lengthen the root vowel (the last two possibilities are exemplified by bad , badet ). There are many nouns with irregular plurals. Here are some examples: Most either have vowel change with or without a suffix, or are foreign words using their native