All versions after Snow Leopard include and will install Recovery HD, from which you can then boot and run Snow Leopard with the Mac App Store installed should let you download at no cost a later version of OS X. Upgrade to a newer version of OS X and use Recovery HD. Booting off that drive will also allow erasing via Disk Utility. Install OSX on an external drive or borrow one with OS X installed. The Mac to erase mounts as a drive, and Disk Utility can be used with it. With two Macs that both have Thunderbolt or FireWire ports, connect them with the appropriate cable, and follow Appleās instructions (either hold down the T key after restarting the one to erase or use Startup Disk on that computer before restarting it).
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