5.1. The numbers $415, 43, 7, 8, 74, 3$ are written on cards (see figure). Arrange the cards in a row so that the resulting ten-digit number is the smallest possible.
Answer: $\square 3415 \square 43 \square 74 \square 7 \square 8$

The correct answer can simply be recorded as the number 3415437478.

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