Ua kapa ʻia ka hui hoʻohaʻahaʻa milo waho pālua a me ka hui hoʻemi hexagonal.He mana evolutionary ia o ka hui wili like anawaena.;I kēia manawa, ʻo ka laulā nui hiki iā mākou ke hāʻawi ma waena o 1/4 iniha a me 4 iniha.