commit 4-1 ISEARCH
commit 4-2 FIXSUM
commit 4-3 INF_SRCH
commit 4-4 CYCLEMIN
commit 4-5 MEDIAN2
commit 4-6 BSEARCH
commit 4-7 SEARCH3
commit 4-8 1ST&2ND
commit 4-9 M_SEARCH
commit 4-10 TWOSQUAR
commit 4-11 MAXSQR