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Update 10_2_Using_Other_Script_Commands.md

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10_2_Using_Other_Script_Commands.md
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@ -48,7 +48,7 @@ Test three numbers:
## Understand Stack Opcodes
There are a shocking number of stack opcodes, but other than `OP_DROP` and `OP_DUP` they're generally not necessary if you're careful about stack ordering. Nonetheless, here are a few of the more interesting ones:
There are a shocking number of stack opcodes, but other than `OP_DROP`, `OP_DUP`, and sometimes `OP_SWAP` they're generally not necessary if you're careful about stack ordering. Nonetheless, here are a few of the more interesting ones:
* OP_DEPTH (0x74) — Pushes the size of the stack
* OP_DROP (0x75) — Pops the top stack item