Are these sentences correct:<br/><br/><span style="color:#ff0000;">1-They failed to prevent such deadly accidents as in our factory.</span><br/><span style="color:#ff0000;">2-They failed to prevent deadly accidents as in our factory.</span><br/><br/><span style="color:#ff0000;">3-They failed to prevent deadly accidents<b>,</b> such as in our factory.</span><br/><span style="color:#ff0000;">4-They failed to prevent deadly accidents<b>,</b> as in our factory.</span><br/><br/>"1" and "2" define a particular kind of "deadly accident".<br/><br/>In "3" and "4", "as" and "such as" are just supposed to mean "for example".<br/><br/>Gratefully,<br/>Navi.