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loads "bash -c {command}" with env by prepending export commands; unfortunately, given pexpect's API, i don't see a cleaner way to do this. previous method of including environment in check50's command didn't work due to bash's environment taking precedence. should allow check50 to work on C programs on new macs if they troubleshoot things like cs50/cs50.readthedocs.io#169. passes all tests on my machine except two skipped valgrind tests