Potential answers for "UNIX or DOS"

⭐⭐⭐⭐ SYS
⭐⭐ XMAIL
⭐⭐ QMAIL
⭐⭐ USERIDS
⭐⭐ OPSYS
⭐⭐ OCTAL
⭐⭐ KEN
⭐⭐ GREP
⭐⭐ DEV
⭐⭐ CERO

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