The key is that concentrating atomic s character in orbitals directed towards electropositive substituents by depleting it in orbitals directed towards electronegative substituents results in an overall lowering of the energy of the system .
DET NOUN AUX SCONJ VERB NOUN PART NOUN ADP NOUN VERB ADP ADJ NOUN ADP VERB PRON ADP NOUN VERB ADP ADJ NOUN NOUN ADP DET ADJ NOUN ADP DET NOUN ADP DET NOUN .