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<div class="parent">
  <h4 class="title">Title</h4>
  <div class="child">Child</div>
  <div class="child">Child</div>
  <div class="child">Child</div>
  <div class="child">Child</div>
  <div class="child">Child</div>
  <div class="child">Child</div>
</div>

* {
  -webkit-box-sizing: border-box;
  -moz-box-sizing: border-box;
  box-sizing: border-box;
}

.parent {
  *zoom: 1;
  max-width: 68em;
  margin-left: auto;
  margin-right: auto;
  border: 1px solid blue;
  padding: 1em 1em 0;
}
.parent:before, .parent:after {
  content: " ";
  display: table;
}
.parent:after {
  clear: both;
}

.child {
  float: left;
  display: block;
  margin-right: 2.3576516%;
  width: 48.8211742%;
  border: 1px solid red;
  margin-bottom: 1em;
  padding: 1em;
  text-align: center;
}
.child:last-child {
  margin-right: 0;
}
.child:nth-child(2n + 1) {
  margin-right: 0;
}

// ----
// Sass (v3.4.21)
// Compass (v1.0.3)
// Bourbon (v4.2.6)
// Neat (v1.6.0)
// ----

@import "bourbon/bourbon";
@import "neat/neat";

.parent {
  @include outer-container;
  border: 1px solid blue;
  padding: 1em 1em 0;
}
.child {
  @include span-columns(6);
  @include omega("2n + 1");
  border: 1px solid red;
  margin-bottom: 1em;
  padding: 1em;
  text-align: center;
}

<div class="parent">
  <h4 class="title">Title</h4>
  <div class="child">Child</div>
  <div class="child">Child</div>
  <div class="child">Child</div>
  <div class="child">Child</div>
  <div class="child">Child</div>
  <div class="child">Child</div>
</div>