将下列程序的执行结果写出来:
begin
array aaa[1..6]
for i ← 1 to 6 step 2 do
aaa[i] ← i
aaa[i+1] ← -i
end
for i ← 1 to 6 step 1 do
if aaa[i]>0 then ch ← ’0’
else ch ← ’9’
for j ← 1 to i step 1 do
write(j,ch)
writeln
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