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The module Chunk contains procedures operating on chunks.
.
{Value.'.'+RC+LIX}
returns the field X of RC at feature LI.
HasFeature
{Value.hasFeature+RC+LI?B}
tests whether RC has feature LI.
CondSelect
{Value.condSelect+RC+LIXY}
returns the field Y of RC at LI, if RC has feature LI. Otherwise, returns X.
IsChunk
{Chunk.is+X?B}
tests whether X is a chunk.
NewChunk
{Chunk.new+R?C}
returns a new chunk with the same features and fields as R.
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