why does instance type "createdevresouces" have 2 instance sizes ?

[jstonebender]

the template only creates one instance and doesn't provide a selection option for instance size - why is the value an array?
"Resources" : {
"EC2Instance" : {
"Type" : "AWS::EC2::Instance",
"Properties" : {
"ImageId" : { "Fn::FindInMap" : [ "RegionMap", { "Ref" : "AWS::Region" }, "AMI" ]},
"InstanceType" : { "Fn::If" : [
"CreateProdResources",
"c1.xlarge",
{"Fn::If" : [
"CreateDevResources",
"m1.large",
"m1.small"