Please assess the completion status of the following clinical trial:

Trial Title: The Effects of Mixed Working Memory Training on Subsequent Training Gains Among Older Adults

Study Design Characteristics:
- Allocation: RANDOMIZED
- Intervention Model: FACTORIAL
- Observational Model: None
- Primary Purpose: BASIC_SCIENCE
- Time Perspective: None
- Masking: SINGLE
- Phase: None
- Number of Arms: 4.0

Eligibility Criteria:
Inclusion Criteria:~* Native English speakers or acquisition of English before age 6 yrs old~* Self-report of hearing ability sufficient to engage with lab personnel~* No stroke in the last 3 years~* No current cancer treatment involving radiation or chemotherapy - No self-reported learning disability~* No self-reported psychiatric disorder~* Willingness to be randomly assigned to training conditions~* No plans that would limit participation during the activity period~* No participation in a cognitive intervention program in the last year~No additional Exclusion Criteria.

- Gender: ALL
- Minimum Age: 60 Years
- Maximum Age: 90 Years
- Healthy Volunteers: t

Study Arms:
- Different Mixed Condition (DM) (Type: EXPERIMENTAL): Training in both Lexical Decision Span and Category Span in Phase 1 (which are both different from the target task Reading Span in Phase 2).
- Different Single Condition (DS) (Type: EXPERIMENTAL): Training in the Lexical Decision Span in Phase 1 (which is different from the target task Reading Span in Phase 2).
- Same Task (ST) Practice Control (Type: ACTIVE_COMPARATOR): Training in Reading Span task in Phase 1 (which is the same as target task in Phase 2).
- Non-WM Placebo Control (PC) (Type: PLACEBO_COMPARATOR): Training in a speeded Lexical Decision task only (which has no memory component) in Phase 1 prior to Phase 2 training in WM.

Based on this trial design, predict the completion outcome and termination type (if applicable).