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+my own personal attempt at making a truth machine in brainfuck
+>+++++++++++++++++++++++++++++++++++++++++++++++++ set memory cell 1 to 49 (ascii code for '1')
+<, move back to cell 0 and read the byte
+------------------------------------------------ subtract 48 to test if it was '0'
+[ if it wasn't zero
+>.< output value of cell 1 and move back (loops forever)
+]>-. otherwise subtract 1 from cell 0 and output the value (ascii code for '0')