~~........                                          ........~~
\~~.......                                          .......~~\
^\~~......                                          ......~~\^
$^\~~.....                                          .....~~\^$
#$^\~~....                                          ....~~\^$#
@#$^\~~...                   body                   ...~~\^$#@
#@#$^\~~.. ................~~\^^\~~................ ..~~\^$#@#
##@#$^\~~.                                          .~~\^$#@##
#@#$^\~~..            a body is a vessel            ..~~\^$#@#
@#$^\~~...            a body is a vessel            ...~~\^$#@
#$^\~~....            a body is a vessel            ....~~\^$#
$^\~~.....            a body is a vessel            .....~~\^$
^\~~......            a body is a vessel            ......~~\^
\~~.......            a body is a vessel            .......~~\
~~........            a body is a vessel            ........~~
~.........            a body is a vessel            .........~
~~........            a body is a vessel            ........~~
\~~.......                                          .......~~\
^\~~......                                          ......~~\^
$^\~~.....                                          .....~~\^$
#$^\~~....                                          ....~~\^$#
@#$^\~~...                                          ...~~\^$#@