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SBFC
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SBFC(Shifted Brainfuck Compressed) is a compressed version of Shifted brainfuck.
Three instructions result 343 possible combinations. If +-, -+, <>, ><, [], ][ and .. are not allowed, then only 252 possible combinations remain, which fits a byte.
Note: .. is sometimes useful, it's excluded just to fit in byte. In this case, some extra effort may be needed.
Variants
Add support of ..+
This allows .. at any place take at most 4 instructions:
abc ..d=>abc ..+ -d(ifdis not+)a..=>a.+ -.
This section doesn't affect the PPCG question