Generated by SassMeister.com.

SassMeister-input.scss

// ----
// libsass (v3.2.5)
// ----

	.guide-block__item {

		flex: 0 1 100%;
		height: auto;

		$count: 1;
		@while $count < 13 {
			&:not(.guide-block__item--image):nth-child(12n+#{$count}) {
				@if $count < 5 {
					@extend %block-3;
				} @elseif $count < 9 {
					@extend %block-1;
				} @else {
					@extend %block-2;
				}
			}
			$count: $count + 1;
		}

	}

SassMeister-output.css

.guide-block__item {
  flex: 0 1 100%;
  height: auto;
}