Build a musical arrangement using the indicated alphabet-based system and the given motif.
X:1
L:1/16
M:2/4
K:F#min
['A4 ABBA', '.[cA]2 .[cA]2']  
X:1
L:1/16
M:2/4
K:F#min
"F#m" A4 ABBA | ABBA"C7" AGGF |"F#m" A4 ABBA |"C7" AGGF"F#m" F4 | [Ac]4 [Ac][Bd][Bd][Ac] | 
 [Ac][Bd][Bd][Ac]"C7" [Ac][GB][GB][FA] |"F#m" [Ac]4 [Ac][Bd][Bd][Ac] | 
"C7" [Ac][GB][GB][FA]"F#m" [FA]4 || |"E7" BcdB"A" c4 | .[cA]2 .[cA]2 .[cA]2 z2 |"E7" GABA B4 | 
"E" .[GE]2"B7" .[AF]2"E" .[BG]2 z2 |"E7" edcB"A" c4 | .[cA]2 .[cA]2 .[cA]2 z2 |"E7" GABA B4 | 
"E" .[GE]2"B7" .[AF]2"E" .[BG]2 z2 || |"E7" EFG2"A" ABc2 |"C7" BAG2"F#m" F4 |"A" AEEA"G" A=GGF | 
"F#m" F8 |"E7" EFG2"A" ABc2 | edc2"Bm" B4 |"A" AEEA"G" A=GGF |"F#m" F8 |]  