What two distinct combinations of Grignard reagent and aldehyde could be used to prepare the alcohol below? 
Definitions:
Population Study
Research conducted on a large group of individuals aimed at understanding the prevalence, incidence, or experience of a particular condition or characteristic within that population.
Experimental Drug
A compound or substance being tested for its therapeutic effects in clinical trials.
Placebo
A substance with no therapeutic effect, often used as a control in testing new drugs to assess the psychological impact of receiving treatment.
Experimenter Bias
A type of bias that occurs when the experimenter's expectations influence the outcome of a research study.
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