Underscoring partial included files

less/_07-flexbox.less

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+/* flexbox layout 
+Tutorial: http://knacss.com/demos/tutoriel.html#flex */
+.flex {
+	display : flex;
+}
+
+.flex-h {
+	flex-direction: row;
+}
+
+.flex-v {
+	flex-direction: column;
+}
+
+.flex-fluid {
+	flex: 1;
+}
+
+.flex-start {
+	order : -1;
+}
+
+.flex-mid {
+	order : 1;
+}
+
+.flex-end {
+	order : 42;
+}