<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def collect_split_adjustments(self, adjustments_for_sid, requested_qtr_data, dates, sid, sid_idx, sid_estimates, split_adjusted_asof_idx, pre_adjustments, post_adjustments, requested_split_adjusted_columns):
 """ Collect split adjustments for previous quarters and apply them to the given dictionary of splits for the given sid. Since overwrites just replace all estimates before the new quarter with NaN, we don't need to worry about re-applying split adjustments. Parameters adjustments_for_sid : dict[str -> dict[int -> list]] The dictionary of adjustments to which splits need to be added. Initially it contains only overwrites. requested_qtr_data : pd.DataFrame The requested quarter data for each calendar date per sid. dates : pd.DatetimeIndex The calendar dates for which estimates data is requested. sid : int The sid for which adjustments need to be collected. sid_idx : int The index of `sid` in the adjusted array. sid_estimates : pd.DataFrame The raw estimates data for the given sid. split_adjusted_asof_idx : int The index in `dates` as-of which the data is split adjusted. pre_adjustments : tuple(list(float), list(int), pd.DatetimeIndex) The adjustment values and indexes in `dates` for adjustments that happened before the split-asof-date. post_adjustments : tuple(list(float), list(int), pd.DatetimeIndex) The adjustment values, indexes in `dates`, and timestamps for adjustments that happened after the split-asof-date. requested_split_adjusted_columns : list of str List of requested split adjusted column names. """

        (pre_adjustments_dict,
         post_adjustments_dict) = self._collect_adjustments(
            requested_qtr_data,
            sid,
            sid_idx,
            sid_estimates,
            split_adjusted_asof_idx,
            pre_adjustments,
            post_adjustments,
            requested_split_adjusted_columns
        )
        self.merge_split_adjustments_with_overwrites(
            pre_adjustments_dict,
            post_adjustments_dict,
            adjustments_for_sid,
            requested_split_adjusted_columns
        )