Deobfuscated ZX Spectrum BASIC fractal code

anti2.bas

11 BORDER 0: PAPER 0: INK 5: CLS 
12 LET du=2.25/255
13 LET dv=2.3/175
14 LET u=-1.6
15 FOR x=0 TO 254
16  LET v=dv
17  FOR y=0 TO 87
18   LET o=0: LET d=0
19   LET uu=0: LET vv=0
20   FOR k=0 TO 16
21    LET u2=uu*uu: LET v2=vv*vv
22    LET q=u2-v2+u: LET w=2*uu*vv + v
23    LET uu=q: LET vv=w
24    IF u2+v2 > 4 THEN LET o=1:GO TO 27
25    LET d=1-d
26   NEXT k
27   IF o THEN IF d THEN PLOT x,y:PLOT x,175-y
28   LET v=v+dv
29  NEXT y
30  PRINT #1; AT 0, 0; INT (x * 100 / 254);"%"
31  LET u=u+du
32 NEXT x
33 PAUSE 0