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No proper program contains an indication which as an operator-applied occurrence identifies an operator-defining occurrence which as an indication-applied occurrence identifies an indication-defining occurrence different from the one identified by the given indication as an indication-applied occurrence. -ALGOL 68 Report
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__ /^\ .' \ / :.\ / \ | :: \ / /. \ / ::: | | |::. \ / :::'/ | / \::. | / :::'/ `--` \' `~~~ ':'/` / ( / 0 _ 0 \ \/ \_/ \/ -== '.' | '.' ==- /\ '-^-' /\ \ _ _ / .-`-((\o/))-`-. _ / //^\\ \ _ ."o".( , .:::. , )."o". |o o\\ \:::::/ //o o| \ \\ |:::::| // / \ \\__/:::::\__// / \ .:.\ `':::'` /.:. / \':: |_ _| ::'/ `---` `"""""` `---`
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