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Section 2.9.5.6 Predefined Standard Variables for ADSL contains sets of timing variables which share a common prefix, such as TRTSDT, TRTSTM, and TRTSDTM. It should be noted that in many instances in Section 2.9.5.6  6 Predefined Standard Variables for ADSL, specific DTF and TMF flags are defined within sets of timing variables. However, imputation flags should be created for all date or time variables when imputation has been performed, even if there is not a specific imputation flag variable mentioned in Section 2.9.5.6   Predefined Standard Variables for ADSL. For example, the imputation flag variable has not been listed for EOSDT, but EOSDTF must be present if date imputation was performed.

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