& thing thing... & => each thing prefixed by &/ &^ &~ resp
& ^ thing thing... & each thing is any non-ws
& ~ thing thing... & & may be omitted before EOL or before \EOL
& thing thing... & => each thing prefixed by &/ &^ &~ resp
& ^ thing thing... & each thing is any non-ws
& ~ thing thing... & & may be omitted before EOL or before \EOL