one particle irreducible
one, one radical (no.1)
イチ / ひと-
grains, drop, counter for tiny particles
リュウ / つぶ
child, sign of the rat, 11PM-1AM, first sign of Chinese zodiac
シ / こ
previously, already, long ago
キ / すで.に
promise, approximately, shrink
ヤク / つづ.まる