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Nouns ending in f or fe, make their plural by changing f or fe into ves, as, calf, calves; knife, knives. Except hoof, roof, grief, dwarf, mischief, handkerchief, relief, muff, ruff, cuff, snuff, stuff, puff, cliff, skiff, with a few others, which in the formation of their plurals follow the general rule.

Nouns in o impure form their plural by adding es, as, hero, heroes; echo, echoes: those which end in o pure, by adding s, as, folio, folios.

Some nouns have their plural in en, thus following the Teutonic termination, as, ox, oxen; man, men.

Some are entirely anomalous, as, die, dice; penny, pence; goose, geese; sow, swine; and brother makes brethren[10], when denoting persons of the same society or profession. Die, a stamp for coining, makes dies in the plural.

Index makes in the plural indexes, when it expresses a table of contents, and indices, when it denotes the exponent of an algebraic quantity.

Some are used alike in both numbers, as, hose[11], deer, sheep, these being either singular or plural.