<style>
.Test-area > div {
  margin: 10px 0;
}
</style>

<div class="Test-area">
	<div class="u-alpha">Alpha</div>
	<div class="u-beta">Beta</div>
	<div class="u-gamma">Gamma</div>
	<div class="u-delta">Delta</div>
	<div class="u-epsilon">Epsilon</div>
	<div class="u-zeta">Zeta</div>
</div>

<div class="Test-area">
  <div class="u-giga">Giga</div>
  <div class="u-mega">Mega</div>
  <div class="u-kilo">Kilo</div>
</div>

<div class="Test-area">
 <div class="u-milli">Milli</div>
 <div class="u-micro">Micro</div>
</div>