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FOR a=1 TO 9
if a<>9 then let s0=s0+1
FOR b=0 to 9
if b=a then goto 80
if a+b<>9 then let s1=s1+1
FOR c=0 to 9
if c=a or c=b then goto 70
if a+b<>9 and a+c<>9 and b+c<>9 then let s2=s2+1
FOR d=0 to 9
if d=a or d=b or d=c then goto 60
IF a+b<>9 AND a+c<>9 AND a+d<>9 AND b+c<>9 AND b+d<>9 AND c+d<>9 THEN LET s3=s3+1
60 next d
70 next c
80 next b
90 NEXT a
PRINT s0;s1;s2;s3;2000-s0-s1-s2-1
END

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FOR a=1 to 9
FOR b=0 to 9
if b=a then goto 30
FOR c=0 TO 9
IF c=a OR c=b THEN GOTO 20
FOR d=0 TO 9
IF d=a OR d=b OR d=c THEN GOTO 10
IF a+b=9 OR a+c=9 OR a+d=9 OR b+c=9 OR b+d=9 OR c+d=9 THEN GOTO 10
LET n=n+1
IF n=1487 THEN PRINT 10^3*a+10^2*b+10*c+d
10 next d
20 next c
30 next b
40 NEXT a
END

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def c(a)
(a.include?(0)&a.include?(9))|(a.include?(1)&a.include?(8))|(a.include?(2)&a.include?(7))|(a.include?(3)&a.include?(6))|(a.include?(4)&a.include?(5))
end
p (0..9).to_a.permutation(4).to_a.delete_if{|s|(s[0]==0)|c(s)}[2000-1-9-72-432]
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def is_valid(num):
¡¡¡¡digits=list(map(int,str(num)))
¡¡¡¡if len(digits)!=len(set(digits)):
¡¡¡¡¡¡¡¡return False
¡¡¡¡for i in range(len(digits)):
¡¡¡¡¡¡¡¡for j in range(i+1,len(digits)):
¡¡¡¡¡¡¡¡¡¡¡¡if digits[i]+digits[j]==9:
¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡return False
¡¡¡¡return True
count=0
num=0
while count<2000:
¡¡¡¡num+=1
¡¡¡¡if is_valid(num):
¡¡¡¡¡¡¡¡count+=1
print(num)
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p (0..9).to_a.repeated_permutation(4).to_a.last(9999).map{|x|x.last(4-x.index{|t|t>0})}.delete_if{|s|(s.size!=s.uniq.size)|((0..s.size-1).to_a.combination(2).map{|y|(s[y[0]]+s[y[1]])==9}.inject(:|))}[1999]
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