Assertion: command | /r/HasProperty | available in tsc flex
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text: The command is available in Multics, TSC FLEX, MetaComCo TRIPOS, Zilog Z80-RIO, Microware OS-9, DOS, Acorn Computers Panos, Digital Research FlexOS, IBM OS/2, Microsoft Windows, ReactOS, HP MPE/iX, KolibriOS, SymbOS, Unix and Unix-like operating systems.