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data_non_numeric
_cell_length_a 'not measured'
_cell_length_b 3(none)
_cell_formula_units_z none
_publication_year unknown
_diffrn_radiation_wavelength time-of-flight
_refine_ls_r_factor_obs small
_cod_duplicate_entry 'none found'
data_non_numeric_inf
_cell_length_a inf
_cell_length_b +inf
_cell_length_c -inf
_cell_measurement_temperature infinity
_diffrn_ambient_temperature +infinity
_diffrn_radiation_wavelength -infinity
data_non_numeric_nan
_cell_length_a NaN
_cell_length_b +nan
_cell_length_c -naN
data_signed
_cell_length_a -5
_cell_formula_units_z -2
_publication_year -10
_diffrn_radiation_wavelength -5000
_cod_duplicate_entry -1
data_overflow
_journal_coeditor_code 'a very long code'
_journal_issue 'a value clearly too long'
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