Nothing
is.subst.mod.tm(c("JC69", "K80", "F81", "HKY85", "HKY85+Gap",
"REV", "SSREV", "REV+GC", "UNREST", "R2", "U2", "R2S",
"U2S", "R3", "R3S", "U3", "U3S", "GC", "HB",
"bad.model"))
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