{
    let: {
		"A": "one",		// not overridden
		"B": "two",		// overridden in joba
		"C": "three",	// overridden in joba and jobb
		"D": "four"		// overridden in jobb
	},
	
	jobs: {
		"joba": {
			let: {
				"B": "joba-two", 		// override global
				"C": "joba-three", 		// override global, overridden in jobb
				"E": "joba-five",		// locally defined, not overridden
				"F": "joba-six"			// locally defined, overridden in jobb
			}
		},
		
		"jobb": {
			extend: [ "joba" ],
			let: {
				"C": "jobb-three",		// override global and joba
				"D": "jobb-four",		// override global
				"F": "jobb-six",		// override job
			}
		}
	}
}