in stacked up heredocs on one line, one has just to think programmical
serial... the bash is tilleof parser data gather mode

{ printf %s\\n "$( </dev/fd/3 )" "$( </dev/fd/4 )" ; } 3<<'eo' 4<<'eo'
one
two
eo
three
four
eo

=+=

one
two
three
four

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