pluralization functions are expressed by full reduplication of monosyllabic stems (without morphophonemic changes) while disyllabic stems only reduplicate their second syllable, often with accompanying accent changes (cf. Miller 1965: 80)
a number of stems always occur in reduplicated form and do not indicate (distributive) plural meaning (cf. Miller 1965: 154; for examples see Miller 1965: 154-156)