Extraordinary patch 89 Let B(n)=m(n),we have (0,0) 0,1) T26 2 ma小S,w0）-Fy,msmM 25 (1,0) For 3sns50,the following fact is found: Maximum of (n),k>1,m=1,2,3 appears in the domain 2=2n{(y,w)v+w≥} To compute the values of B(n),only four subpatchs SS,S,S;are needed to be analyzed. Extraordinary patch Let , we have For , the following fact is found: „ Maximum of appears in the domain To compute the values of , only four subpatchs are needed to be analyzed. 1, 1,2,3 ( ) max ( ) k m k m β n n β ≥ = = (, ) max ( , ) ( , ) ( ) v w vw vw nM β ∈Ω S F− ≤ 3 50 ≤ ≤ n ( ), 1, 1,2,3 k m β nk m ≥ = 1 4 Ω =Ω∩ + ≥ {(, ) vw v w } β ( ) n 11 2 2 121 2 SSSS