Red[
	Dialect: {
pair! (req) - block size: record size x number of records
[MAX] integer! (opt) - value size: string length for values in records. MAX
						switches to variable size
}
]

make-string: func [
	"Return random string!"
	length [integer!] "String size"
][
	collect/into [
		loop length [keep random/only "abcdefghijklmnopqrstuvwxyz"]
	] make string! length
]

make-block: function [
	"Make block of records from simple dialect"
	desc [block!]
][
	value-size: 8 ; default value size
	variable-value-size?: false
	record-size: 0
	length: 0
	parse desc [
		set value pair! (
			record-size: value/x
			length: value/y
		)
		opt ['max (variable-value-size?: true)]
		opt [set value-size integer!]
	]
	collect/into [
		loop length [
			keep/only collect/into [
				loop record-size [
					keep make-string either variable-value-size? [
						random value-size
					][
						value-size
					]
				]
			] make block! record-size
		]
	] make block! length
]