echo `zecho foo {1,2} bar`
echo $(zecho foo {1,2} bar)
+var=baz
+varx=vx
+vary=vy
+
+echo foo{bar,${var}.}
+echo foo{bar,${var}}
+
+echo "${var}"{x,y}
+echo $var{x,y}
+echo ${var}{x,y}
+
+unset var varx vary
+
# new sequence brace operators
echo {1..10}