code: def big_sol(x, n):
      y = np.ones((2 * n, x.size))
      y[::2] = x
      return x
  
imports: import sys
  import numpy
  from numpy.testing import assert_, assert_array_equal, assert_allclose, assert_equal
  from pytest import raises
  from scipy.sparse import coo_matrix
  from scipy.special import erf
  from scipy.integrate._bvp import modify_mesh, estimate_fun_jac, estimate_bc_jac, compute_jac_indices, construct_global_jac, solve_bvp
label_desc: Use image node_id 21 for calling a global function with example usage: big_sol(x, n) and returns: x