Finnish of the Helsinki area there are grammatical minimal pairs, e.g. nominative Stadi "Helsinki" vs. partitive Stadii. In Finnish, Estonian and Sami languages, there are also two allophonic lengths of the chroneme, half-long and over-long. For example, Finnish imperative anna! "give!" has a short vowel, oma "own" has a half-long vowel, and Annaa (partitive case of the name Anna) has an overlong vowel (without any distinctive tonal variation to distinguish these three). Estonian and Sami also have a three-way distinction in consonants, e.g. lina "bed sheet", linna (half-long 'n') "of the city", linna (over-long 'n') "to the city". Estonian, in which the phonemic opposition is the strongest, uses tonal contour as a secondary cue to distinguish the two; "over-long" is falling as in other Finnic languages, but "half-long" is rising. Finnish also denotes stress principally by adding more length (approximately 100 ms) to the vowel of the syllable nucleus. This means that Finnish has five different physical lengths. (The half-long vowel is a phonemically short vowel appearing in the second syllable, if the first—and thus stressed—syllable is a single short vowel.) The unstressed short vowels are about 40 ms in physical duration, the unstressed long vowels about 70 ms. The stress adds about 100 ms, giving short stressed as 130–150 ms and long stressed as 170–180 ms. The half-long vowel, which is always short unstressed, is distinctively longer than the standard 40 ms. Japanese is another language in which vowel length is distinctive. For example, biru is a foreign loan word (clipped from a longer form) that means "building" whereas bīru is a foreign loan word for "beer". Using a notion intuitive to a speaker of Japanese, it could be said that more than anything, what differentiates bīru from biru is an extra mora (or minimal vowel syllable) in the speech rhythm that signifies a lengthening of the vowel . However, upon observation one might also note a rise in pitch and intensity of the longer vowel. It could be said, also, that vowel lengthening—chronemic contrasts—nearly doubles Japanese's rather small inventory of vowel phonemes (though the occurrence of diphthongs also augments vowel counts). Due to native literacy practices, Japanese long vowels are often thought of as sequences of two vowels of the same quality (rather than one vowel of a greater quantity or length) since that is how they are sometimes written. In the case of consonants of Japanese, if