Example with mandatory variables not filled in

var1: a                       # The first variable
var2: a                       # The second variable

Example with all variables modifiable

var1: a                       # The first variable
var2: a                       # The second variable
var3: a                       # The third variable
var4: b                       # The forth variable
var5: a                       # The fifth variable
var6: 1                       # The sixth variable