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name1 = name1-value
name2 =

${name1?name 1 defined, |$name1|$name2|}
${name1:name 1 undefined, |$name1|$name2|}
${name2?name 2 defined, |$name1|$name2|}
${name2:name 2 undefined, |$name1|$name2|}
|$name1|$name2|
$(name1
$(name )

name2 = name2-value

${name1?name 1 defined, |$name1|$name2|}
${name1:name 1 undefined, |$name1|$name2|}
${name2?name 2 defined, |$name1|$name2|}
${name2:name 2 undefined, |$name1|$name2|}
|$name1|$name2|