<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def _jobStoreClasses(self):
 """ A list of concrete AbstractJobStore implementations whose dependencies are installed. :rtype: list[AbstractJobStore] """

        jobStoreClassNames = (
            "toil.jobStores.azureJobStore.AzureJobStore",
            "toil.jobStores.fileJobStore.FileJobStore",
            "toil.jobStores.googleJobStore.GoogleJobStore",
            "toil.jobStores.aws.jobStore.AWSJobStore",
            "toil.jobStores.abstractJobStore.JobStoreSupport")
        jobStoreClasses = []
        for className in jobStoreClassNames:
            moduleName, className = className.rsplit('.', 1)
            from importlib import import_module
            try:
                module = import_module(moduleName)
            except ImportError:
                logger.debug("Unable to import '%s' as is expected if the corresponding extra was "
                             "omitted at installation time.", moduleName)
            else:
                jobStoreClass = getattr(module, className)
                jobStoreClasses.append(jobStoreClass)
        return jobStoreClasses