John Halleck's Data for Ken Pledger's Modal Logic system 6s:

# Ken Pledger's system 6s = S4
=include s3
L     => LL

LMML  => LML
LML   => LMLL
LMLL  => LLML

LMM   => LM
LM    => LMLLM
LMLLM => LLM

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This snapshot was last modified on August 23rd, 2000
And the underlying file was last modified on July 11th, 2000