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The radix-10 number <[33]>10 is 33 in decimal and it is the radix-4 number <[201]>4. Radix-B numbers never need leading zeros unless you have to extend them to a certain number of digits. Leading zeros don't change the value of Radix-B numbers.

However, 33 in decimal is the 4-complement number <[0201]>4. Here, we need a leading zero, since otherwise, the number <[201]>4 would be -31. With 4-complement numbers leading digits 0,1 denote non-negative numbers, and leading digits 2,3 denote negative numbers.