javascript - JQuery get a contiguous sequnce of elements -

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i'm trying contiguous array of elements using jquery. exmaple html:

<div class="parent">     <div class="childtype2">1</div>     <div class="childtype2">2</div>     <div class="childtype2">3</div>     <div class="childtype1">4</div>     <div class="childtype1">5</div>     <div class="childtype1">6</div>     <div class="childtype1">7</div>     <div class="childtype2">8</div>     <div class="childtype1">9</div>     <div class="childtype1">10</div>     <div class="childtype1">11</div>     <div class="childtype1">12</div> </div>

i want return div's containing 4,5,6,7 (the first sequnce of divs class="childtype1").

i tried 

$("<div>test</div>")($('.parent .childtype2').siblings('.childtype1').addback());

but of course add div text test after last childtype1 (12).

sorry noob question , bad english! i'm not jquery.

edit:

since div's dynamiclly generated, ended adding each "group" special class post-fix of id related group, , used method described in suspectus's answer. not had in mind, works :d. alot of answers guys!

<div class="parent">     <div class="childtype2">1</div>     <div class="childtype2">2</div>     <div class="childtype2">3</div>     <div class="childtype1 inner">4</div>     <div class="childtype1 inner">5</div>     <div class="childtype1 inner">6</div>     <div class="childtype1 inner">7</div>     <div class="childtype2">8</div>     <div class="childtype1">9</div>     <div class="childtype1">10</div>     <div class="childtype1">11</div>     <div class="childtype1">12</div> </div>    $(".inner") // gives elements required

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