collapseos/blk/295

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( DE contains prev offset )
HL POP, ( <-- lvl 2 )
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( HL is prev field's addr. Is offset zero? )
DEZ,
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IFNZ,
( get absolute addr from offset )
( carry cleared from "or e" )
DE SBCHLd,
EXDEHL, ( result in DE )
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THEN,
HL POP, ( <-- lvl 1 )
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JRNZ, AGAIN, ( inner-B292, try to match again )
( Z set? end of dict, unset Z )
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( cont. )