<html><head><style>body{font-family:Helvetica,Arial;font-size:13px}</style></head><body style="word-wrap:break-word"><div id="bloop_customfont" style="font-family:Helvetica,Arial;font-size:13px;color:rgba(0,0,0,1.0);margin:0px;line-height:auto"><br></div> <br><p class="airmail_on">On 4 July 2016 at 7:38:48 PM, Skip Montanaro (<a href="mailto:skip.montanaro@gmail.com">skip.montanaro@gmail.com</a>) wrote:</p> <div><blockquote type="cite" class="clean_bq" style="font-family:Helvetica,Arial;font-size:13px;font-style:normal;font-weight:normal;letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px"><span><div><span style="color:rgb(0,0,0);font-family:'helvetica Neue',helvetica;font-size:14px;font-style:normal;font-weight:normal;letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;background-color:rgb(255,255,255);float:none;display:inline!important">Oh, cool. Precisely the sort of solution I was hoping would turn up.</span></div></span></blockquote></div><p><br></p><p>Except it doesn’t seem to meet your original spec, which retrieved the first item of each *run* of an index value?</p><div></div></body></html>