Description: duplicate top two words of stack and put
duplicate beneath fourth word of stack
Stack
| Before |
After |
| whatever1 |
whatever1 |
| whatever2 |
whatever2 |
| whatever3 |
whatever3 |
| whatever4 |
whatever4 |
| |
whatever1 |
| |
whatever2 |
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Opcodes indexed by function.
Opcodes indexed by number.
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