. "bsection (31) of this section; (9) Grant leases of trust property, with or without options to purchase or renew, to begin within a reasonable period and for terms within or extending beyond the duration of the trust, for any purpose including exploration for and removal of oil, gas and other minerals; enter into community oil leases, pooling and unitization agreements; (10) Subdivide, develop, ded" . . . . . . . .