1A. tabs,lf etc.
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E-sources are pure ascii format files, with the linefeed <lf> and
semicolon ";" being the separators for two statements. Statements
that have particularly many arguments, may be spread over several lines
by ending a line with a comma (or any other lexical element that can
normally never occur at the end of a line), thus ignoring the following
<lf> (see  5A  for line endings). Any lexical element in a source code
file may be separated from another by any number of spaces, tabs etc.