the ratio of the length to width of the national flag or
Singapore is 5 : 3
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Islamic Flag
I think the flag you are looking for is the Singapore flag.
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the Singapore flag was first unveiled on 3rd November 1959 by
Toh Chin Chye.
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Right now, Singapore has no intention to change its flag in the
near future. Perhaps after a few decades the flag may be changed,
but nobody knows at this moment.