Abstract: A number of embodiments of four-cylinder, four-cycle outboard motors having a compact exhaust system and yet one in which the exhaust pulses from one cylinder are not transmitted to other cylinders so as to interfere with their operation. This is accomplished by providing a series of paired exhaust manifolds with no two successive firing cylinders being served by the same manifold.

Abstract: A deinking composition for regeneration of waste paper by floatation comprises 99.7 to 97% by weight of a mixture which comprises monoalkyl ethers of ethylene oxide/propylene oxide copolymers represented by the following general formulas (A) and (B) and the mixing ratio of the compound (A) to the compound (B) ranges from 10:90 to 90:10 (weight ratio); and about 0.3 to about 3.0% by weight of a polyoxyalkylene oxide selected from the group consisting of polyethylene oxides, polypropylene oxide and ethylene oxide/propylene oxide copolymers:R.sup.1 O-(PO).sub.n1 -[(EO).sub.m.(PO).sub.n2 ]-H (A)R.sup.2 O-(EO).sub.m1 -[(EO).sub.m2.(PO).sub.n ]-H (B)wherein m/(n1+n2) ranges from 0.5 to 1.5; (m1+m2)/n ranges from 1.1 to 2.0; EO and PO represent ethylene oxide and propylene oxide units respectively; and the EO and PO in the brackets may be in either a random or block configuration. The deinking composition exhibits excellent deinking properties.