Another Secondary Alphabetical Order

Question

Here is another Secondary Alphabetical Order:

If you can figure out the rest of the order, the arrows will hint you how the letters should be written.

Answer 1

The key of the order is:

Morse code representation of each alphabet (- is smaller than . in ASCII)

 T -     ←
 M --
 O ---   ←
 G --.
 Q --.-
 Z --..
 N -.
 K -.-
 Y -.--
 C -.-.
 D -..   ↔︎
 X -..-
 B -...
 E .
 A .-    →
 W .--
 J .---
 P .--.
 R .-.
 L .-..
 I ..
 U ..-
 F ..-.
 S ...   →
 V ...-
 H ....  →
 

The arrows mean:

If we read letters with leftward arrows(←) from right to left, it says DOT.
If we read letters with rightward arrows(→) from left to right, it says DASH.
Morse code uses dots and dashes, obviously!