Sk6812 rgbw trinket m0 strange run

hi to all
sorry for my poor english, i’m italian.
i want realize a couple of neopixel
from 4 neopixel numerated obviously 0, 1, 2, 3 make couple 0, 2 and 1, 3
and make light effect using the corde “range”.
the neopixel are sk6812 rgbw.

but… those are the result:

cannot find any code to realize the “range” with rgbw pixels or strip.

thank you